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As a leading Equivalent to Exolit AP750 supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What is the difference in thermal stability between Equivalent to Exolit AP750 and original Exolit AP750, and what is the impact on high-temperature processing plastics?
Equivalent to Exolit AP750 has similar thermal stability to original Exolit AP750, and has little impact on high-temperature processing plastics. Thermogravimetric analysis shows that the 5% weight loss temperature of Equivalent to Exolit AP750 is 320℃, while that of the original product is 325℃, with a difference of less than 5℃, both of which can meet the requirements of high-temperature processing plastics. In the processing of polyetheretherketone (PEEK) (processing temperature 380-400℃), adding 15% of Equivalent to Exolit AP750, the thermal decomposition temperature of the material is still maintained above 370℃, which is equivalent to the material with the original product added, and the material performance will not be reduced due to the decomposition of the flame retardant.
In terms of the effect on the fluidity of high-temperature processed plastics, when 20% of Equivalent to Exolit AP750 is added to polyphenylene sulfide (PPS), the melt flow rate is 18g/10min, which is close to the original product (17g/10min). It has good filling performance during injection molding and is suitable for making thin-walled high-temperature parts. It has excellent chemical stability at high temperatures and will not react chemically with polyimide (PI) during processing. The flame retardant performance of the product has no obvious attenuation when used for a long time in a 200℃ environment, and the oxygen index retention rate is more than 95%.
In practical applications, for plastics with a processing temperature of 300-350℃ (such as PA46), Equivalent to Exolit AP750 performs the same as the original product; for extremely high-temperature processed plastics exceeding 380℃, it is recommended to reduce the addition amount by 1-2% and appropriately increase the processing temperature by 5℃ to compensate for slight differences in thermal stability and ensure stable product quality.
What is the effect of particle size distribution of Equivalent to Exolit AP750 on its flame retardant effect?
The particle size distribution of Equivalent to Exolit AP750 has a significant effect on the flame retardant effect, and the particle size needs to be controlled according to different processing techniques. When the particle size is small (D50=5-8μm), the specific surface area is large, the contact with the plastic material is more complete, the flame retardant decomposes quickly, and the carbon layer can be quickly formed in thin-walled products (such as PET film with a thickness of 0.5mm), the flame retardant effect is better, and the oxygen index is 1-2 units higher than that of coarse-grained products. However, if the particle size is too small, it is easy to agglomerate, resulting in uneven dispersion, which in turn reduces the local flame retardant effect. Therefore, it is necessary to control the particle size distribution span (D90/D10) <3.
When the particle size is large (D50=15-20μm), the fluidity is good, which is suitable for thick-walled products (such as PA6 pipes with a diameter of 50mm) for extrusion molding. It is not easy to clog the filter during processing, and the wear on the screw is small. In the injection molding process, medium particle size (D50=10-12μm) is more suitable, which can not only ensure uniform dispersion, but also reduce the increase of melt viscosity and make the filling smooth.
What is the synergistic effect when Equivalent to Exolit AP750 is used in combination with other flame retardants?
When Equivalent to Exolit AP750 is used in combination with a variety of flame retardants, the synergistic effect is significant, and different compounding schemes are suitable for different scenarios. When compounded with nitrogen-based flame retardants (such as melamine pyrophosphate), mixed in polyamide 6 at a ratio of 3:1, and adding a total amount of 20%, the oxygen index can reach 35, which is significantly improved compared to using Equivalent to Exolit AP750 alone (oxygen index 32), and the carbon layer is denser. This is because phosphorus-nitrogen synergistically enhances the stability of the carbon layer, which is suitable for electrical equipment housings that require a high oxygen index.
When compounded with inorganic flame retardants (such as aluminum hydroxide), added to polypropylene at a ratio of 1:2, with a total amount of 30%, the vertical combustion level reaches V-0, and the mechanical properties decrease, and the tensile strength retention rate is increased from 80% when used alone to 85%, which is suitable for polypropylene products with high mechanical properties requirements, such as car bumpers. When compounded with silicon-based flame retardants (such as polysiloxane), adding 15% Equivalent to Exolit AP750 and 3% silicon-based flame retardants to epoxy resin can make the material reach V-0 level and increase the impact strength by 10%, which is suitable for electronic potting glue.
What should be paid attention to during the storage and transportation of Equivalent to Exolit AP750?
During the storage and transportation of Equivalent to Exolit AP750, attention should be paid to moisture, high temperature, and impurity pollution to prevent performance degradation. When storing, it should be placed in a dry warehouse with relative humidity controlled below 50%. Because the flame retardant is slightly hygroscopic, when the humidity exceeds 60%, it will be slightly agglomerated after 30 days of storage. It needs to be broken before use, which affects the dispersion. The warehouse temperature needs to be controlled at 10-30℃, avoid direct sunlight. High temperature will accelerate its oxidation, causing the 5% weight loss temperature to drop by 2-3℃, so ventilation and cooling are required in summer, and insulation is done in winter.
The packaging adopts a double-layer structure, the inner layer is an aluminum-plastic composite bag (thickness ≥0.15mm), heat-sealed, and the outer layer is a galvanized iron barrel. The barrel cover is added with a rubber gasket to ensure a tight seal. The net weight of each barrel is 25kg, and the barrel body is marked with "moisture-proof" and "high temperature-proof" logos. When transporting, use a box truck or van to avoid rain and exposure. The temperature during transportation does not exceed 40℃. Handle it gently during loading and unloading to prevent the iron barrel from deformation and damage.
What are the advantages of Equivalent to Exolit AP750 over the original product in market applications? What issues should users pay attention to when switching to use?
Equivalent to Exolit AP750 has obvious advantages in market applications. Users should pay attention to process adjustments and compatibility tests when switching to use. In terms of substitution advantages, the price is lower, 10-15% lower than the original product, and the supply cycle is short, which can meet customers' urgent production needs, especially suitable for small and medium-sized enterprises to reduce costs. In terms of performance, except for slightly lower thermal stability (within 5°C), other indicators (such as flame retardant efficiency and dispersibility) are equivalent to the original product, and can be directly replaced in most application scenarios.
When users switch to use, they must first conduct a small test to test the flame retardant and mechanical properties in the target plastic to confirm that the difference with the original product is within an acceptable range. In terms of processing technology, because Equivalent to Exolit AP750 has slightly better fluidity, the screw speed can be appropriately reduced by 5-10% to avoid material degradation caused by excessive shearing. In injection molding, the mold temperature can be reduced by 5°C to compensate for the flash problem that may be caused by increased fluidity.
In terms of compatibility, it is necessary to test the compatibility with other additives in plastics (such as antioxidants and toughening agents). For example, when compounding with antioxidant 1010 in polypropylene, it is necessary to confirm that there is no adverse reaction, which can be verified by thermal aging test (performance change after 120℃ and 1000 hours). For export products, relevant certification tests need to be re-performed. Although the environmental protection index of Equivalent to Exolit AP750 meets the standard, different brands may need to resubmit material certification. Through meticulous conversion preparation, users can successfully replace the original product and achieve cost reduction and efficiency improvement.