Competitive Di-Pentaerythritol 85-95% min. (Micronized) prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at
+8615380400285
or mail to
sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
As a leading Di-Pentaerythritol 85-95% min. (Micronized) supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What are the details of the purity range control during the preparation of TDi-Pentaerythritol 85-95% min. (Micronized)?
This product is made from the crude product of the condensation reaction of formaldehyde and acetaldehyde as the base material, and is crystallized and purified in steps: first, the crude product is dissolved in 75℃ hot water (solid-liquid ratio 1:5), filtered to remove the residue, and the filtrate is cooled to 35℃ to precipitate 95% grade crystals; the mother liquor is heated to 60℃, and then cooled to 25℃ to obtain 90% grade; the remaining mother liquor is concentrated and cooled to 15℃ to obtain 85% grade. Each grade of crystals is separately pulverized by air flow, with a nitrogen pressure of 0.75MPa and a classifying wheel speed of 3200 rpm to make a D50=4μm powder, namely TDi-Pentaerythritol 85-95% min. (Micronized). The hydroxyl content of 95% grade is 39%±0.4%, and the ash content is less than 0.08%; the hydroxyl content of 85% grade is 36%±0.6%, and the ash content is less than 0.15%. When crushing, the jacket is passed with cooling water, and the temperature is controlled at less than 55℃ to prevent particle agglomeration. The loose density of the powder is 0.38g/cm³ and the specific surface area is 12m²/g. This process is like sieving grains, separating them according to the purity gradient, so that each level of products can be adapted to different flame retardant scenarios, taking into account both performance and cost.
What is the synergistic effect of TDi-Pentaerythritol 85-95% min. (Micronized) in flame retardant cable materials?
The 95% grade product is compounded with ammonium polyphosphate (APP) at a ratio of 1:4, and the total addition amount is 35% for EVA cable material (VA content 28%). After mixing in a twin-screw extruder (temperature 160-180℃), the cable sheath expands within 30 seconds when burning. The thickness of the carbon layer reaches 18 times the original diameter, the carbon layer density is 0.2g/cm³, and the thermal conductivity is 0.03W/(m・K). The vertical burning test reaches UL94 V-0 level (3.2mm), and the oxygen index increases from 20% to 33%, which is 3 percentage points higher than the 85% grade. The 90% grade is used for low-smoke halogen-free cable material, compounded with magnesium hydroxide at a ratio of 2:5, with an addition amount of 40%, and a smoke density rating (SDR) of 42, which is much lower than the 70 of pure EVA, and the tensile strength is retained by 82% (12MPa). The 85% grade is suitable for ordinary cables, with an addition amount of 45%. The cost is 12% lower than that of the 95% grade, and the flame retardant time is 60 minutes, meeting the basic flame retardant requirements. Its ultra-fine particles (4μm) can fill the gaps in the cable materials and increase the surface smoothness of the sheath by 15%. Therefore, it can be selected according to performance requirements in cable flame retardancy to balance the effect and economy.
What are the characteristics of the synergistic mechanism of TDi-Pentaerythritol 85-95% min. (Micronized) and phosphorus flame retardants?
When this substance is matched with Melamine Polyphosphate (MPP), the hydroxyl group and the phosphate group in the molecule undergo esterification reaction at 280℃ to generate a polyphosphate intermediate, and the catalytic substrate carbonization rate is 30% faster than that of single use. The 95% grade and MPP are compounded in a ratio of 1:2 for PA66. The carbon layer formation time during combustion is 18 seconds, which is 5 seconds shorter than the 85% grade. This is because the high-purity product has a high hydroxyl density and stronger reaction activity. In the PP system, it can promote the combination of carbon layer and phosphorus oxide to form a dense protective layer in synergy with phosphate flame retardant, and increase the residual weight of carbon layer from 25% to 40%. Its ultrafine particles (4μm) can be evenly dispersed among flame retardants, increasing the reaction contact area, increasing the synergistic efficiency by 20%, solving the problem of flame retardant fluctuation caused by uneven dispersion in traditional compounding, so it can stably play a synergistic role in multiple systems.
What is the difference between the application of TDi-Pentaerythritol 85-95% min. (Micronized) in coatings and adhesives?
When used in solvent-based fire retardant coatings, the 95% grade is compounded with expanded graphite at a ratio of 3:1, with an addition amount of 55%. The coated steel plate (dry film 1mm) can withstand 1000℃ flame burning for 75 minutes, the back temperature is less than 145℃, and the adhesion is level 1. The 90% grade is used for water-based coatings and is compatible with ammonium polyphosphate. The dispersion stability is up to 5 months, the coating water resistance (immersion for 6 days) is wrinkle-free, and the cost is 8% lower than the 95% grade. In polyurethane adhesives, the 85% grade is added at a 15% amount, reacting with isocyanate to form a flame-retardant cross-linked structure, so that the bonding strength is retained by 85% (2.5MPa), and the oxygen index is increased from 21% to 28%. Its ultra-fine particles can fill the micropores of coatings and adhesives, and increase the density of dry films by 18%. Therefore, it can be selected according to the purity in different dosage forms, which can not only ensure flame retardant performance, but also adapt to product characteristics.
What is the processing adaptability of different purity levels of TDi-Pentaerythritol 85-95% min. (Micronized)?
The 95% grade is suitable for precision injection molding parts, such as electronic connectors. It needs to be mixed with APP in a precise ratio (1:3.5), with a twin-screw speed of 280 rpm, a temperature control of 200-220℃, and high-temperature decomposition prevention. The product size accuracy reaches ±0.02mm. The 90% grade is used for extruded sheets, with an addition amount of 38% and a screw speed of 220 rpm. Due to its slightly lower purity, it can withstand slightly higher shear and is not prone to melt fracture. The 85% grade is used for molded products, such as distribution box shells, with an addition amount of 42%, a processing temperature of 180℃, and a pressure of 15MPa. Due to its low cost, it is suitable for large-scale production. During storage, the 95% grade needs to be controlled to be less than 45%, and the 85% grade can be relaxed to less than 65%. Each grade needs to be stored in a partition to avoid mixing. In terms of processing equipment, 316 stainless steel is used for high-purity grades, and carbon steel can be used for low-purity grades. The equipment is selected according to product requirements to ensure stable performance.