Zinc Borate ZnB-1H

Zinc borate ZnB-1H is a monohydrate zinc borate flame retardant and enhancer developed by Taixing using precise crystal shape control and silane modification technology. It breaks the wide dehydration range of traditional multi hydrate zinc borate and accurately anchors its crystal water content in an approximate monohydrate state through a patented process, thereby significantly increasing and narrowing the starting temperature of the main dehydration reaction. It can be used in combination with magnesium hydroxide, aluminum hydroxide, and phosphorus nitrogen flame retardants to significantly improve the carbonization, smoke suppression, and anti dripping properties of the flame retardant system. Thus achieving a crucial leap from 'potentially qualified' to 'inevitably excellent'.

Core strengths

The dehydration behavior of traditional 2ZnO·3B₂O₃·3.5H₂O occurs in a relatively low and wide temperature range (~290-350 ° C), which dangerously overlaps with the processing temperatures of many materials. The innovation of ZnB-1H stems from fundamental adjustments to the crystal structure.

1. The "redshift" and "sharpening" of dehydration thermodynamics

·Redshift: Through structural regulation, the removal temperature of the weakest bound water molecules in the crystal is significantly shifted towards higher temperatures (redshift), increasing the initial dehydration temperature (Tonset) from about 290 ° C to above 380 ° C.

·Sharpening: At the same time, the dehydration process becomes more concentrated and rapid, and the heat release peak (DSC peak) becomes narrower and higher. This means that it is extremely stable at processing temperatures, but can instantly release maximum heat absorption potential and gas-phase dilution in the event of a fire, with extremely high efficiency.

2. Precise control of surface energy and "zero induced degradation"

Even without significant dehydration during processing, the trace amounts of water and active sites adsorbed on the surface of hydrates may catalyze the hydrolysis or thermal degradation of polymers, especially polyesters and polyamides.

·The extremely low and stable hydration state of ZnB-1H, combined with special surface passivation techniques, makes its surface chemically inert.

·It does not absorb moisture from the environment and does not release active protons in the melt, thus completely eliminating the risk of induced degradation of sensitive polymer chains (such as PET, PBT, PA), protecting the material's intrinsic viscosity, molecular weight, and final mechanical properties.

3. Delayed start and efficient output of condensed phase activity

After dehydration, the active boron zinc oxide produced by ZnB-1H has a higher specific surface area and reactivity. This' delayed start 'mechanism ensures that its function of catalyzing char formation and promoting the formation of ceramic barriers can fully erupt in the fire environment, without being consumed prematurely or undergoing side reactions with the substrate during processing, achieving maximum functional efficiency.

Application field

Application 1: High temperature nylon and PBT electronic connector

·Pain point: The injection molding temperature of connector materials (PA6T, PA9T, PBT) often reaches 290-320 ° C. Traditional zinc borate can easily cause screw slippage, product silver lines, or batch fluctuations in mechanical properties.

·ZnB-1H scheme: Fully immune to the above processing temperatures with its dehydration starting point of ≥ 380 ° C. While maintaining excellent flame retardant synergy (through UL94 V-0), ensure the stability and excellence of the material's dielectric strength and CTI value (relative leakage trace index), meeting the USCAR or IEC 60512 standards for automotive electronics.

Application 2: High temperature resistant special wires and cables

·Pain point: Halogen free flame-retardant cable materials at 105 ° C, 125 ° C, and even 150 ° C levels need to remain stable during long-term high-temperature use and short-term high-temperature extrusion. Traditional additives are prone to volatilization or decomposition, leading to foaming and performance degradation.

·ZnB-1H solution: In combination with high heat-resistant polymers, it provides long-lasting flame retardant and smoke suppression protection. Its low volatility ensures that after long-term thermal aging testing (such as 136 ° C, 168 hours), the oxygen index and mechanical property retention of the material far exceed those of conventional systems.

Frequently Asked Questions

Q1: Is zinc borate ZnB-1H the same concept as "dehydrated zinc borate"? If not, what's the difference?

A1: Not exactly the same, this is the key difference. Dehydrated zinc borate "is a process description that refers to the removal of some or all of the crystalline water through calcination, but the hydration state of the final product may be amorphous or unstable, posing a risk of moisture absorption and regain. ZnB-1H is a thermodynamically stable crystalline product. We directly grow stable crystal structures with monohydrate characteristics through precise control of the synthesis pathway. It does not actively absorb water from the environment to recover to a high hydration state, so its ultra-high dehydration onset temperature is intrinsic and can be permanently maintained, which is the fundamental basis of its reliability.

Q2: For special polymers (such as PPS) with processing temperatures exceeding 380 ° C, is zinc borate ZnB-1H still applicable?

A2: This is a good boundary problem. When the processing temperature approaches or exceeds its dehydration starting point, careful evaluation is necessary. For PPS (processing temperature~320-350 ° C), ZnB-1H is still adept. For ultra-high temperature polymers (such as LCP) with processing temperatures of around 400 ° C, we recommend using customized models that are completely anhydrous.

Q3: Will extremely low water content affect its effectiveness as a smoke suppressant? After all, water vapor is an effective diluent.

A3: This is a cognitive misconception. The main mechanism of smoke suppression does not rely on the trace amount of water vapor released by the additive itself (which accounts for a very small proportion in a fire), but rather on promoting the formation of condensed phase char to fix carbon atoms, as well as altering the generation and oxidation process of gas-phase smoke particles. ZnB-1H releases its bound water at higher temperatures, which can play a role in the more intense stages of a fire, and its strong catalytic ability to form charcoal is the main force in suppressing smoke. Actual test data shows that its smoke suppression efficiency (Ds max reduction rate) is comparable to or even better than high hydration products, as it can convert more carbon into a stable carbon layer rather than smoke particles.

Q4: Can zinc borate ZnB-1H replace antimony oxide?

A4: Sure. In most flame retardant systems, zinc borate ZnB-1H can replace 30% -50% antimony oxide, retaining excellent synergistic flame retardant effects while completely solving the heavy metal toxicity and environmental compliance issues of antimony oxide, while reducing raw material costs.

If you are looking for zinc borate ZnB-1H, monohydrate zinc borate, low hydrate zinc borate, silane modified zinc borate, cable material flame retardant, RoHS certified zinc borate, plastic flame retardant enhancer, Taixing will be your best choice and we will offer the most favorable cooperation price.