Medium heat resistant zinc borate

Medium heat resistant zinc borate is a specialized flame retardant and efficiency enhancing agent produced by Taixing. Unlike the high premium of high heat stable zinc borate and the shortcomings of ordinary zinc borate in terms of heat resistance, this product achieves a precise balance between heat resistance, synergistic efficiency, and cost-effectiveness. It can be compounded with magnesium hydroxide, aluminum hydroxide, and phosphorus nitrogen flame retardants and widely used in the fields of medium temperature extruded PVC profiles, rubber seals, fireproof coatings, etc., helping enterprises to meet flame retardant requirements while controlling production costs and better assisting enterprises in reducing costs and increasing efficiency.

Flame retardant mechanism

Gradient temperature controlled crystallization+surface activation process

Adopting three-stage gradient temperature control and atmospheric pressure crystallization technology, the crystal growth rate and crystal structure are precisely controlled to avoid lattice defects caused by rapid crystallization, and the decomposition temperature of the product is stabilized at 290 ℃± 5 ℃; The supporting fatty acid salt surface activation treatment forms a hydrophobic layer on the crystal surface, improving its dispersibility and compatibility in polymer substrates. The synergistic flame retardant efficiency is increased by more than 30% compared to unactivated ordinary zinc borate, and the activation cost is only 40% of silane modification, balancing performance and economy.

Flame retardant and efficiency enhancing mechanism

1. Medium temperature endothermic stable decomposition: The performance is stable within the temperature range of material processing, without premature dehydration decomposition; The combustion stage gradually releases crystalline water, absorbs a large amount of heat to reduce the surface temperature of the substrate, inhibits the thermal decomposition process of the polymer, and reduces the generation of combustible gases.

2. Carbon layer reinforcement and propagation prevention: The decomposed boronic acid groups crosslink with the combustion products of the substrate, promoting the formation of a continuous and dense porous carbon layer, blocking the bidirectional transfer of oxygen and heat, delaying the flame propagation speed, and improving the erosion resistance of the carbon layer.

3. Gas phase free radical capture: Boron containing gas phase components can efficiently capture active free radicals such as · OH and · H in the combustion chain reaction, cut off the flame propagation path, assist in reducing smoke density, and reduce the release of toxic gases such as carbon monoxide.

Core strengths

1. Accurate moderate heat resistance, suitable for medium temperature processing scenarios

-The decomposition temperature is stable at 290 ℃± 5 ℃, perfectly matching the conventional processing temperature of 180-250 ℃ for materials such as PVC, EVA, and natural rubber. It will not cause defects such as bubbles, yellowing, or mechanical property degradation in the product due to premature decomposition;

-The thermal weight loss rate is ≤ 0.5% (maintained at 230 ℃ for 2 hours), and the heat stability far exceeds that of ordinary zinc borate pentahydrate, meeting the requirements of medium temperature continuous processing production lines.

2. High collaborative efficiency, reducing overall production costs

-When compounded with aluminum hydroxide for PVC profiles, the total amount of inorganic flame retardants added can be reduced by 15% -20%, while maintaining the UL94 V-2 flame retardant rating and reducing raw material procurement costs by 10% -12%;

-The recommended addition amount is 7% -12% (based on the total mass of the material), which significantly enhances the efficiency of the phosphorus nitrogen flame retardant system. It can increase the oxygen index of the material by 3-4 units and improve the integrity of the carbon layer by 40%;

-The product price is only 55% -65% of the high heat stable monohydrate zinc borate, with outstanding cost-effectiveness advantages, suitable for the cost reduction needs of small and medium-sized enterprises.

3. Zero halogen environmental protection

-100% halogen-free, antimony free, and heavy metal free. When burned, it does not release toxic and corrosive gases such as hydrogen halides and cyanides. The smoke density (SDR) is reduced by more than 35% compared to halogen flame retardant systems;

-The combustion residue is stable zinc borate salt, with no secondary pollution, in compliance with industrial solid waste treatment standards, and does not require additional environmental treatment costs.

4. Process friendly, compatible with multiple categories of medium temperature processing materials

-Excellent compatibility with medium temperature processing materials such as PVC, EVA, natural rubber, and styrene butadiene rubber, with uniform dispersion and no obvious agglomeration, without affecting the conventional processing techniques such as extrusion, injection molding, rolling, and coating of materials;

-The basic mechanical properties such as tensile strength and elongation at break of the material are not significantly reduced, and the impact strength retention rate of PVC profiles is over 85%, fully meeting the daily industrial product usage needs;

-The impact on product coloring is minimal, and it can adapt to conventional color requirements such as white, gray, and black without the need for additional adjustment of color masterbatch ratios, reducing processing and debugging costs.

Application scenarios

Scenario 1: Halogen free flame retardant modified polypropylene (PP) automotive parts

PP materials are commonly used for automotive fans, ducts, brackets, and other components, and their halogen-free flame retardant modification processing temperature often reaches 240-260 ℃. Standard zinc borate is on the edge of failure, which can easily cause microbubbles or performance fluctuations; High temperature models are too expensive.

Scenario 2: Thin walled electronic and electrical casing (PA6, PBT)

Routers, miniature circuit breaker enclosures, etc. are made of PA6 or PBT, with injection molding temperatures ranging from 260-280 ℃. Sensitive to the thermal stability of additives, flame retardants are required to not decompose or produce gases at high temperatures to ensure appearance and dimensional accuracy.

Scenario 3: Medium to high temperature level (105 ℃ -125 ℃) wires and cables

The polyolefin or halogen-free elastomer sheath material for this type of cable has a high extrusion temperature and requires that the flame retardant performance of the material does not deteriorate after long-term thermal aging.

Frequently Asked Questions

Q1: What is the difference between medium heat-resistant zinc borate and ordinary pentahydrate zinc borate?

A1: The decomposition temperature of ordinary pentahydrate zinc borate is about 270 ℃, which is prone to premature decomposition during medium and high temperature processing, leading to product defects; The decomposition temperature of medium heat-resistant zinc borate has been raised to 290 ℃, which is suitable for processing scenarios at 180-250 ℃. After surface activation, the dispersibility and synergistic efficiency are better.

Q2: "Medium heat resistance" is a relatively vague concept. How do you accurately define and ensure its reliability?

A2: We define it through an "application-oriented" quantitative definition: to ensure that the volatile matter production rate of the product is less than 0.5% under standard simulated processing conditions of 280 ℃ for 10 minutes, and there is no aggregation phase transition that affects the performance of the product. The guaranteed starting point of dehydration at ≥ 260 ℃ is a conservative data under strict testing conditions (TGA, 10 ° C/min). In actual screw cutting and processing with shorter dwell times, its effective safety window is higher. Each batch of products comes with a TGA curve for that temperature range, providing customers with transparent data boundaries.

Q3: In the industry trend of pursuing higher heat resistance, is medium heat resistant product a transitional solution?

A3: On the contrary, we believe it is a long-term rational market segmentation. Material selection is essentially a game between performance and cost. The performance requirements and cost pressures of a large number of applications, such as the aforementioned automotive and home appliances, naturally define a demand platform for "moderate heat resistance". It allows customers to spend their money precisely on the performance of solving practical problems, avoiding paying for unused performance reserves, which is in line with the fundamental principle of value engineering.

If you are looking for medium heat resistant zinc borate, medium temperature stable flame retardant, heat stability enhancing zinc borate, trihydrate zinc borate, medium temperature processing flame retardant, Taixing will be your best choice, and we will provide the most favorable price cooperation!