Highly Filled Magnesium Hydroxide

The highly filling magnesium hydroxide produced by Taixing is a high-performance inorganic flame retardant developed and produced for the contradiction between high flame retardant demand and substrate performance degradation, as well as the conflict between high load filling and processing fluidity in mid to high end manufacturing. It is widely suitable for large-scale application scenarios such as flame retardant masterbatch, rubber foam materials, fireproof sealing adhesives, thick walled flame retardant products, etc., providing manufacturing enterprises with an integrated flame retardant solution with high flame retardant rating, low performance loss, and low cost investment.

Core strengths

1. Collaborative flame retardant mechanism

-High temperature stable heat absorption: The initial decomposition temperature is 340 ℃ (peak decomposition temperature is 438 ℃), which perfectly matches the processing temperature range of high polymer materials such as PP, PE, EVA, TPE (175-265 ℃), avoiding local overheating decomposition caused by powder agglomeration under high filling amounts. The heat absorption per unit mass reaches 1355J/g, which can quickly absorb combustion heat and block chain reactions, providing long-lasting safety protection for thick walled products and foam materials;

-Dense carbon layer protection: By using crystal morphology control technology to shape a regular spherical crystal structure (diameter to thickness ratio 4:1), it can still be uniformly distributed inside the substrate under high filling levels. During combustion, a continuous and dense magnesium oxide ceramic carbon layer is formed, resulting in a density increase of 62%. It can maintain structural integrity for at least 130 minutes in a 1000 ℃ flame environment, effectively blocking the transfer of heat, oxygen, and combustible gases, and completely eliminating the risk of melting droplets;

-Low smoke, non-toxic and environmentally friendly: It does not contain harmful ingredients such as halogens, antimony, lead, etc. When burned, it only releases clean water vapor, and does not emit toxic gases such as hydrogen halides and dioxins. The smoke density ratio (SDR) is ≤ 78, and the smoke toxicity reaches GB/T 20284-2006 ZA1 level. With a high filling volume of 65%, no additional smoke suppressants need to be added, which can meet the environmental flame retardant requirements of densely populated places.

2. Hyperbranched coating modification technology, dual compatibility of high filling and processing performance

-High filling adaptability: The hyperbranched polymer coating layer can form a flexible interface layer between the powder and the substrate, effectively alleviating the stress concentration problem caused by high filling. The filling amount can reach 50% -65%, far higher than the upper limit of 35% -45% of traditional magnesium hydroxide; Under a 60% filling amount in the PP system, the impact toughness can still reach 4.2 kJ/m ², the tensile strength is ≥ 16.5 MPa, and the mechanical property retention rate is ≥ 88%;

-Excellent processing flowability: After coating modification, the oil absorption value of the powder is as low as 22mL/100g, which is 18% lower than that of traditional high filled magnesium hydroxide, significantly improving the melt flow rate of composite materials (MFR ≥ 12g/10min at 60% filling amount), reducing equipment torque and energy consumption during extrusion, injection molding, and foaming processes (measured energy saving of 22%), reducing mold wear, and adapting to the large-scale production needs of high-speed production lines (screw speed ≤ 700rpm);

-High dispersion uniformity: After modification, the zeta potential absolute value of the powder is ≥ 35mV, the electrostatic repulsion between particles is strong, and there is no agglomeration phenomenon. The dispersion uniformity in the polymer matrix is ≥ 98%, ensuring the appearance flatness and performance uniformity of thick walled products and foam materials, and avoiding local flame retardant failure caused by uneven dispersion.

3. Customized adaptation for segmented scenarios

-Flame retardant masterbatch special type: Good flowability, uniform masterbatch particle size (2-3mm) under 65% high filling, no breakage or sticking phenomenon, suitable for twin-screw granulation process;

-Foam material specific type: Excellent compatibility with foaming agents, does not affect the cell structure (cell diameter 50-100μm), flame retardant grade reaches B1 level, closed cell rate ≥ 90%;

-Special type of sealant: good thixotropy, smooth extrusion of sealant with 55% filling amount, no particle sensation, and tensile bonding strength ≥ 0.8MPa after curing;

-Special type for thick walled products: excellent dispersibility, 30mm thick products have no internal defects, flame retardant rating reaches UL94 V0 level, and no performance degradation has been tested after 1000 hours of wet heat aging;

-Functional upgrade options: Provide weather resistant (-60℃-230℃stable performance), low dust (dust flying amount ≤ 0.9mg/m ³, in compliance with OSHA standards), high whiteness (whiteness ≥ 97.8%) and other functional products to meet the personalized needs of different application scenarios.

Application field

1. Flame retardant masterbatch field

-High filling flame retardant masterbatch: used for the production of PP, PE, EVA flame retardant masterbatch, with a filling amount of up to 65%. The resulting masterbatch has good flowability, uniform particle size, no breakage or sticking phenomenon, and is suitable for twin-screw granulation process; By adding masterbatch in proportion to the substrate, flame retardant modification of the product can be quickly achieved without the need for additional adjustment of processing parameters. It is widely used in plastic pipes, films, injection molded parts and other products, and the flame retardant level can easily reach UL94 V0 level;

-Functional composite master batch: successfully compounded with antioxidant and light stabilizer, the composite master batch can still maintain excellent dispersion and compatibility under 60% high filling content. When added to polymer materials, it can simultaneously achieve dual functions of flame retardancy and anti-aging, reduce the types of master batch added, and reduce the complexity of downstream enterprises' formulas.

2. Rubber foam material field

-Flame retardant foam board: used in the production of XPS, EPS, EVA flame retardant foam board, with a filling content of 55%, excellent compatibility with foaming agents, and no impact on the formation and uniformity of foam cells (cell diameter50-100μm). The flame retardant grade of the foam board made reaches B1 level, with a thermal conductivity coefficient of ≤ 0.038W/(m · K), and both flame retardant and insulation properties. It is widely used in building exterior wall insulation, cold chain logistics compartment insulation and other scenarios;

-Flame retardant foam sealing strip: used in the production of flame retardant foam sealing strips for automobiles and rail transit, with a filling amount of 50%. The resulting sealing strip has good elasticity, a rebound rate of ≥ 90%, and a flame retardant rating of UL94 V0. It also has weather resistance and aging resistance, and has passed 1000 hours of UV aging testing without cracking or hardening. It is suitable for sealing parts such as doors, windows, and carriages.

3. Fire sealant and coating field

-Fireproof sealant: used in the production of building and power fire sealant, with a filling amount of 55%. After modification, the powder has good thixotropy and excellent compatibility with the sealant matrix. The sealant produced has smooth extrusion, no particle sensation, and a tensile bonding strength of ≥ 0.8MPa after curing. When exposed to fire, it expands to form a dense carbon layer, blocking the spread of flames and toxic gases. It meets the national standard GB 23864-2009 "Fireproof Sealing Materials";

-Thick coated fireproof coating: used in the production of thick coated fireproof coating for steel structures, with a filling amount of 50%, it can improve the flame retardant durability and mechanical strength of the coating. Even when the coating thickness reaches 50mm, there is still no cracking or peeling phenomenon. The fire resistance time is ≥ 3h, and the thickness of the formed expanded carbon layer is ≥ 20mm, effectively protecting steel structures from high temperature damage. It is suitable for industrial plants, high-rise buildings, bridges and other large steel structure protection.

4. Thick walled flame retardant products field

-Thick walled plastic pipe: used for the production of PVC and PP flame-retardant water supply pipes and conduit pipes, with a filling content of 60%. The resulting pipe has a wall thickness of up to 30mm, no internal defects, and a flame-retardant rating of UL94 V0. It also has excellent pressure resistance and corrosion resistance, complying with the national standard GB/T 10002.1-2018. It is widely used in building water supply and drainage, power engineering wiring and other scenarios;

-Automotive Lightweight Components: Used for the production of PP and PA automotive interior thick walled components (such as door panels and center console bases), with a filling content of 55%. The resulting components have a flame retardant rating of UL94 V0 and an impact toughness of ≥ 4.0kJ/m ², while achieving lightweight (reducing weight by 15%), meeting the environmental protection and flame retardant requirements of the automotive industry, and helping car companies reduce overall fuel consumption.

Frequently Asked Questions (FAQ)

Q1: What is the core difference between high filling magnesium hydroxide and traditional magnesium hydroxide?

A1: Core difference: ① Upper limit of filling amount: High filling products can reach 65%, while traditional products only have 35% -45%, which can significantly reduce resin usage and lower costs; ② Mechanical performance retention: The mechanical performance retention rate of high filling products at 60% filling amount is ≥ 88%, while the retention rate of traditional products at 45% filling amount is only 60% -70%, and the substrate is prone to brittleness; ③ Processing flowability: The oil absorption value of high filling products is as low as 22mL/100g, with low processing energy consumption. Traditional products have an oil absorption value of ≥ 30mL/100g, which can easily lead to melt sticking and strip breakage; ④ Core advantage: Achieving a balance between "flame retardancy, cost, and performance" through high filling, solving the pain points of traditional flame retardant solutions.

Q2: How to determine the amount of high filling magnesium hydroxide added to different substrates?  

A2: The amount of addition should be combined with the substrate type, product thickness, and target flame retardant level. Conventional reference: ① PP flame retardant masterbatch: 60% -65%; ② EVA foam board: 50% -55%; ③ Fireproof sealant: 50% -55%; ④ 30mm thick wall pipe: 55% -60%.

Q3: What are the core advantages of high filling magnesium hydroxide?

A3: ① Environmental friendliness: halogen-free and non-toxic, does not release carcinogenic or corrosive gases during combustion, conforms to the global trend of halogen-free policies, and avoids the REACH restriction risks of halogenated products; ② Safety: Smoke suppression effect increased by 60%, smoke density ratio ≤ 78, ensuring personnel escape in case of fire, and decomposition products are non corrosive and harmless to equipment; ③ Economy: The high filling characteristics significantly reduce the amount of resin used, and the comprehensive usage cost is more than 28% lower than that of halogen flame retardant solutions. At the same time, it helps enterprises improve their ESG performance and enhance their competitiveness in the international market.

If you are looking for high filling magnesium hydroxide, high load flame retardant, and halogen-free flame retardant masterbatch specific magnesium hydroxide, Taixing will be your best partner and we will provide the lowest price cooperation!