Hydrotalcite

Hydrotalcite is an anionic layered compound. Layered compounds are a kind of compounds with layered structure and intercalation exchangeability. By using intercalation and intercalation exchangeability of layered compounds under the action of strong polar molecules, some functional substances are introduced into the interlayer space and the distance between layers is stretched to form pillared compounds. Hydrotalcite like compounds (LDHs) are a new kind of inorganic functional materials with layered structure. The chemical composition of LDHs is closely related to the cation characteristics, charge density or anion exchange capacity, supramolecular intercalation structure etc.

1. Due to its unique structure, hydrotalcite can be used as basic catalyst, redox catalyst and catalyst carrier.

2. Hydrotalcite compounds can be used in antacids for treatment of gastric diseases, such as gastritis, gastric ulcer, duodenal ulcer and other common diseases.

3. LDH and LDO have been used as ion exchanger or adsorbent in printing & dyeing, papermaking, electroplating and nuclear wastewater treatment.

Below products of Zehui Group are applicable for hydrotalcite.

Magnesium Oxide: ZH-V2-2

Magnesium Hydroxide: ZH-H2; ZH-H3; ZH-H4

Typical Analysis	Magnesium Oxide								Magnesium Hydroxide
Test Items	ZH-V2-1	ZH-V2-2		ZH-V3		ZH-V3H		ZH-V4	ZH-H8
MgO≥ %	99	98	98	98	98	99	99	95	95
Acid-insoluble substance≤%	0.05	0.1	0.1	0.05	0.05	0.1	0.1	0.05	0.1
Loss on ignition≤%	0.5	2	2	2	2	1	1	5	30-33
C1≤%	0.05	0.35	0.5	0.3	0.3	0.05	0.02		0.3
SO4 ≤%	0.05	0.05	0.05	0.3	0.3	0.2	0.2	0.3	1.5
Ca≤%	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.5
K ≤%	/	0.005	0.005	0.005	0.005	0.005	0.005
Na ≤%	/	0.01	0.01	0.01	0.01	0.01	0.01
Fe ≤%	0.005	0.005	0.005	0.01	0.01	0.005	0.005	0.01	0.05
Mn ≤%	0.003	0.002	0.002	0.003	0.003	0.003	0.003
D50 ≤μm	8	6	8	15-30	20-60	45-70	45-70	≥30	4.5
D90 ≤μm	20-40	15-35	20-30	70-90	80-140	90-140	90-140
Bulk density (g/ml)	≤0.4	≤0.4	≤0.4	0.45-0.65	≥0.65	≥0.5	≥0.5	≥0.4	≤0.6

LCD Glass

Typical Analysis	Magnesium Carbonate		Magnesium Oxide
Test Items	ZH-4H	ZH-4H-2	ZH-V3H
MgO %≥	40	40	99	99
Acid-insoluble substance≤%	0.15	0.15	0.1	0.1
Loss on ignition %	54-58	54-60	1	1
CI≤%	0.1	0.1	0.05	0.02
Ca≤%	0.2	0.2	0.01	0.01
Fe ≤%	0.01	0.01	0.005	0.005
K≤%			0.005	0.005
Na≤%			0.01	0.01
Mn≤%			0.003	0.003
SO4≤%	1.5	0.1	0.2	0.2
Bulk density (g/mL)	≥0.4	≥0.35	≥0.5	≥0.5
D50 size≤um	≥40		45-70	45-70
D90 size≤um	100		90-140	90-140

Magnesium Stearate

The Magnesium Oxide and Magnesium Hydroxide are commonly used in dry process of magnesium stearate materials.

Magnesium stearate, chemical formula C36H70MgO4 molecular weight 591.24, is an organic compound, white fine powder without sand; slightly smelly. It feels greasy in contact with skin. The application of magnesium stearate are as following:

1. It is mainly used as lubricant, anti adhesion agent and flow aid

2. It can be used as heat stabilizer of PVC, lubricant of ABS, amino resin, phenolic resin and urea formaldehyde resin.

3. This product is widely used in food additives, medicine, coatings, plastic rubber, textile and other industries, mainly as anti caking agent, emulsifier, release agent, lubricant, stabilizer, thickener, accelerator, cosmetics etc.

4. It can be used as film-forming coating material of solid preparation, thickening agent of colloidal liquid preparation, suspension agent and lubricating release agent of tablets.

These products of Zehui Group are applicable for magnesium stearate.

Magnesium Oxide: ZH-V3H; ZH-V3L; ZH-V2
Magnesium Hydroxide: ZH-H2-2; ZH-H3-1

Typical Analysis	Magnesium Oxide			Magnesium Hydroxide
Test Items	ZH-V3H		ZH-V4I	ZH-H3	ZH-H4
MgO≥ %	99	99	95	99	99
Acid-insoluble substance≤%	0.1	0.1	0.5	0.1	0.1
Loss on ignition≤%	1	1	5	30-33	30-33
C1≤%	0.05	0.02	0.5	0.6	0.6
SO4 ≤%	0.2	0.2	0.5	0.5	0.5
Ca≤%	0.01	0.01	0.5	0.01	0.01
K ≤%	0.005	0.005		0.005	0.005
Na ≤%	0.01	0.01		0.01	0.01
Fe ≤%	0.005	0.005	0.05	0.005	0.005
Mn ≤%	0.003	0.003		0.002	0.002
D50 ≤μm	45-70	45-70	8	3	4.5
D90 ≤μm	90-140	90-140	20-40
Bulk density (g/ml)	≥0.5	≥0.5	≤0.4	≤0.4	≤0.5

Microwave Dielectric Ceramics

Microwave dielectric ceramics are used in microwave band circuit as dielectric materials with one or multiple functions. They are the key materials of microwave components such as resonators, filters, capacitors, dielectric guided wave circuits etc, which are widely used in modern communication.

Application of microwave dielectric ceramics: mobile communication, satellite communication, military radar, satellite positioning and navigation system, automobile navigation, etc.

Application of ceramic dielectric filter: filter is an important part of base station RF devices, which is widely used in communication base station and terminal RF signal processing module. The advantages of ceramic dielectric filter are small size, light weight and low cost under the same frequency requirements.

Below products of Zehui Group are applicable for microwave dielectric ceramics.

Magnesium Oxide: ZH-V3H; ZH-V3; ZH-V2

Magnesium Hydroxide: H-H4; ZH-H3-1

Typical Analysis	Magnesium Carbonate
Test Items	ZH-1		ZH-4L		Industrial Level 1#
MgO %≥	40	42.5-45.8	40	40	40	42
Acid-insoluble substance≤%	0.05	0.05	0.15	0.15	0.05	0.05
Loss on ignition %	55.5-60.0	55.5-60.0	54-60	54-60	54-58	54-58
CI≤%	0.05	0.05	0.1	0.1	0.05	0.05
Ca≤%	0.1	0.1	0.2	0.2	0.7	0.3
Fe ≤%	0.005	0.005	0.01	0.01	0.05	0.02
K≤%	0.01	0.01
Na≤%	0.1	0.04
Mn≤%	0.002	0.002
SO4≤%	0.05	0.05	0.1	0.1	0.15	0.15
Bulk density (g/mL)	0.15-0.25	0.15-0.25	0.2-0.3	0.25-0.3	≤0.15	≤0.15
D50 size≤um	10	10	10	20	30	20
D90 size≤um		20				70

Flame Retardant

Test Items	YQ10	YQ20	YQ30
Mg(OH)2%	≥ 98.5	≥ 99.5	≥ 90
Loss on ignition(800°C)%	≥ 30	≥ 30	≥ 29.5
Fe%	≤ 0.01	≤ 0.005	≤ 0.2
CI%	≤ 0.4	≤ 0.05	≤ 0.01
Water%	≤ 0.5	≤ 0.5	≤ 0.5
D50 size um	1.5~2.5	1.4~1.8	2.5~5.0
325 mesh pass%	≥ 99.75	≥ 99.9	≥ 99.75
Whiteness%	≥ 97	≥ 97	≥ 95

YQ10 & YQ20 are magnesium hydroxide produced by chemical synthesis, with high purity and uniform particle size distribution. At the same time, they have excellent flame retardant and smoke suppression functions. They are an excellent choice for manufacturing green halogen-free and environment-friendly flame retardant materials. The thermal decomposition of the product can absorb a large amount of heat on surface of combustor and release a large amount of water to dilute oxygen. The magnesium oxide generated after decomposion is attached to surface of combustor to further isolate the transfer of oxygen and heat, so as to prevent combustion. Compared with aluminum hydroxide, magnesium hydroxide has the advantages of high decomposition and absorption heat, good thermal stability and low relative hardness.

YQ30 is magnesium hydroxide produced from mine material. This product has high purity and uniform particle size distribution. Compared with other magnesium hydroxide, it has excellent performance and improves the compatibility between inorganic fillers and polymers, with remarkable effects on improving the flame retardancy, tensile strength and low-temperature properties of composites.

Pharmaceutical / Food

Typical Analysis	Magnesium Oxide		Magnesium Carbonate		Magnesium Hydroxide
Test Items	ZH-VUSPH	ZH-VUSPL	ZH-USPL	ZH-USPH	ZH-HUSPL	ZH-HUSPH	ZH-HBPL
MgO≥ %	96-100.5	96-100.5	40-43.5	40-43.5	95-100.5	95-100.5	95-100.5
Acid-insoluble substance≤%	0.1	0.1	0.05	0.05			0.1
Loss on ignition≤%	10	10			30-33	30-33	29-32.5
C1≤%							0.1
SO4 ≤%							0.01
Ca≤%	1.1	1.1	0.45	0.45	1.5	1.5	1.5
K ≤%
Fe ≤%	0.05	0.05	0.02	0.02			0.07
D50 ≤μm	45-70
D90 ≤μm	90-140
Bulk density (g/ml)	≥0.4	≤0.4	≤0.4	≥0.4	≤0.4	≥0.4	≤0.4

Professional Magnesia Compound Manufacturers

Application