Zinc Borate

3.5 zinc borate water molecular formula: 2ZnO • 3B2O3 • 3.5H2O molecular weight: 434.51. Zinc borate is an inorganic additive flame retardant, which is characterized by good thermal stability, I .e. flame retardant and smoke elimination. It can replace antimony trioxide in some products and can also be used in conjunction with other inorganic flame retardants with better effect. Anhydrous zinc borate molecular structure formula is 2ZnO · 3B2O3, white powder, excellent fluidity, temperature resistance to 600 ℃, low heat release rate. Very low water solubility, no migration, and excellent charring performance, can be compounded with other additives into halogen-free expansion flame retardant, can be used as a high processing temperature polymer (polyether ketone, polyalum, polyester, nylon, fluorine-containing polymer, etc.) excellent flame retardant and smoke suppression agent.

Key words:

Zinc Borate

Classification:

Halogen-free flame retardant

Inorganic flame retardant

Product Description

Zinc borate Molecular formula: 2ZnO • 3B2O3 • 3.5H2O Molecular weight: 434.5
1.Technical indicators

Project Name	Indicators
Appearance	White powder
Zinc Oxide%	36.0-39.0
Boron oxide%	46.0-49.0
External water% ≤	1.0
Ignition loss%	13.5-15.5
Melting point ℃ ≥	980
Temperature of crystallization water in weightlessness ℃ ≥	320
refractive index	1.58
CAS NO.	1332-07-6

2. flame retardant mechanism ：

Zinc borate is an environmentally friendly non-halogen flame retardant, which has the characteristics of non-toxic, low water solubility, high thermal stability, small particle size, small specific gravity, and good dispersion. When zinc borate is heated to a certain temperature, it is decomposed to release crystal water, which plays a role of endothermic cooling and dilution of oxygen in the air. At high temperature, zinc borate decomposes to generate B2O3 (if the material contains chlorine or bromine, it also generates ZnX2, ZnOX. X is Cl or Br), which adheres to the surface of the polymer to form a layer of covering layer, which can inhibit the generation of flammable gases and prevent oxidation and thermal decomposition. In halogen-containing materials, BX3 is also generated during combustion, BX3 reacts with water in the gas phase to generate HX, and halogen atom radicals are generated in the flame. The radicals can prevent the chain reaction of hydroxyl radicals, thus playing a flame retardant effect.

3.Use

3.1. As a multifunctional synergistic additive of antimony oxide or other halogen flame retardants, it can effectively improve the flame retardant performance, reduce the generation of smoke during combustion, and can adjust the chemical, mechanical, and electrical properties of rubber and plastic products. As a partial or complete environmentally friendly substitute for halogen-containing flame retardants, it is widely used in the processing of plastics and rubber directly, such as PVC, PE, PP, reinforced polyamide, polyurethane, polystyrene, epoxy resin, polyester acid vinyl resin and natural rubber, styrene butadiene rubber, neoprene, etc.

3.2. It is used in the production of paper, fiber fabric, decorative board, floor leather, wallpaper, carpet, ceramic glaze, fungicide and coating to improve flame retardant performance.

3.3, used for anti-corrosion, far infrared absorption, wood insect and bacteria treatment and other fields.
4.Packaging, transportation and storage
Packing: inner plastic and outer woven coated bag, net weight of each bag is 25kg.
Transportation: This product is a non-dangerous product. It is protected from moisture, rain and packaging damage during transportation.
Storage: stored in dry and ventilated warehouse

.

anhydrous zinc borate

Anhydrous zinc borate molecular structure formula is 2ZnO · 3B2O3, white powder, excellent fluidity, temperature resistance to 600 ℃, low heat release rate. Very low water solubility, no migration, and excellent charring performance, can be compounded with other additives into halogen-free expansion flame retardant, can be used as a high processing temperature polymer (polyether ketone, polyalum, polyester, nylon, fluorine-containing polymer, etc.) excellent flame retardant and smoke suppression agent.
1.
Product Index

Brand Indicators	ZB23
Boron oxide%	54.0-56.0
Zinc Oxide%	44.0-46.0
exterior water% ≤	0.5
Burning weightlessness% ≤	1.5（450℃）
Whiteness ≥	90
particle size	5--8
325Mesh screen residue% ≤	0.5
Pb（ppm）≤	10
Cd（ppm）≤	5
Fe（ppm）≤	30
Melting Point℃	980
molecular weight	371.6
Class Don't.	boric acid method