Anatase titanium dioxide physicochemical properties

Physical Properties
In the commonly used white pigment, titanium dioxide anatase relative density of the smallest. Anatase at high temperatures will be transformed into rutile, anatase

titanium dioxide thus melting and boiling points are actually non-existent. Anatase type titanium dioxide is relatively low dielectric constant, only 48. Anatase

titanium dioxide Mohs hardness of 5.5 to 6.0, so in order to avoid fiber matting and the use of orifice wear tio2 anatase . A titanium dioxide is better, but the coloring

strength of only 70% of R-type, the weatherability test join the A-type titanium dioxide film after only one year later began cracking or peeling fragmented, while

adding R-type titania Specimen After ten years later only a small change in its appearance. Since R-type titanium dioxide tinting strength and weather resistance,

better use of R-type plastics coloring titanium dioxide as well.
Chemical properties
Anatase titanium dioxide chemically extremely stable, is an acidic amphoteric oxide. At room temperature and almost no compound with other elements, oxygen, ammonia,

nitrogen, hydrogen sulfide, carbon dioxide, sulfur dioxide, does not work, do not dissolve in water, fat, nor soluble in dilute acid and inorganic acids, bases, only

the dissolved hydrogen hydrofluoric acid. However, under the action of the light, titanium dioxide can occur continuously redox reactions, with photochemical activity.

This via photochemical activity, ultraviolet irradiation anatase titanium dioxide is particularly evident, even though some of the properties of titanium dioxide

oxidation catalyst photosensitive inorganic compounds, and certain organic photosensitive reduction catalyst

Three forms of titanium dioxide

Titanium dioxide has three crystalline forms in nature: rutile, anatase and titanium plates.
Titanium plate is orthorhombic, crystal form is unstable, i.e. at above 650 ℃ into rutile, therefore no practical value industrially. Anatase is stable at room

temperature, but at high temperatures would like rutile conversion. Depending on the manufacturing method and transformed intensity during calcination is added with

inhibit or promote the like conditions. Generally considered less at 165 ℃ for almost no crystal transformation, more than 730 ℃ when the conversion quickly. Rutile

titanium dioxide is the most stable crystalline form, compact structure, as compared with anatase with high hardness, density, dielectric constant and refractive

index. Rutile and anatase are tetragonal system, but have different lattice, and thus the X-ray images are also different, anatase type io2 anatase in the

diffraction angle of 25.5 °, a diffraction angle in rutile 27.5 °. Rutile crystal slender, prism, usually twinning; while anatase approximate regular octahedral

general.

Fluorescent whitening whitening principle

Fluorescent brightener is whiten the fibers and paper chemicals in general. In the part of the lining of synthetic detergents, with both of these
optical brightener are added fiber lining that fall on the original white, so that the fabric color is more bright, slowing fabric yellowing

, Injury, played better washing effect. Fluorescent brighteners in laundry detergent is widely used. Whether foreign markets or the domestic market, almost all of the detergent and most of the liquid laundry detergent products, fluorescent brightener are added.
Fluorescent brightener is whiten the fibers and paper chemicals in general. In the part of the lining of synthetic detergents, with both of these optical brighteners are added fiber lining that fall on the original white, so that the fabric color is more bright, slowing fabric yellowing

, Injury, played better washing effect. Fluorescent brighteners in laundry detergent is widely used. Whether foreign markets or the domestic market, almost all of the detergent and most of the liquid laundry detergent products, fluorescent brighteners are added.

Lead salt stabilizer

Lead salt
(1) tribasic lead sulfate
(2) dibasic lead phosphite
(3) Dibasic lead stearate
Compound lead salt stabilizer metal soaps Profile
Metal soaps monomer liquid organic tin stabilizer
(A) sulfur-containing organic tin;
(2) an organic tin carboxylate: The organic antimony rare earth stabilizer stabilizer main function of an auxiliary heat stabilizer species

Another type of stabilizer

Liquid metal composite stabilizer liquid metal composite stabilizer is mainly barium - zinc, calcium - zinc and other co-stabilizer complex liquid system. Metal composite PVC stabilizer include zinc, magnesium, barium or calcium stearate, oleate, caprylate, p-tert-butyl benzoic acid

One or more esters, and other co-stabilizers and lubricants. Most barium - zinc stabilizer system is the liquid metal complex soap, and calcium - zinc similar to the system, but mainly carboxylate. Similarly, all of the stabilizer system will need to be added in co-stabilizers

Optimize performance, the type of co-stabilizers and calcium - zinc same system, and sometimes contain a solvent. Liquid metal composite stabilizer replaced in many areas of cadmium-based stabilizers.
Depending on the performance requirements, such as transparency, good initial color and long-term stability, and the filler, the pigment system, such as compatibility, one pack stabilizer formulations need to be adjusted. Some recipes can achieve better performance are required of the state, but also a

These can only make one, two achieve the best performance. Zinc soaps or potassium - a class of zinc soap is barium - zinc soap belonging to the same series of special liquid soap, they are mainly lauric acid ester or salt thereof, or a plastisol foam manufacture, as the blowing agent The PVC stabilizer and

Catalyst (or stimulants). Liquid metal stabilizers typically used following application areas of soft PVC: calendered film, injection soles, extruded tubing (rubber hose), plastisol (coated fabrics, toys).

Have, inorganic flame retardant

Inorganic PVC flame retardant materials
Antimony trioxide. Must be used in conjunction with organic flame retardant material.
Magnesium hydroxide, aluminum hydroxide. Can be used separately, but adding large, often a considerable amount of the resin.
Inorganic phosphorus. Common red phosphorus and sulfate, before use of pure red phosphorus and finally through the micro-processing, can be used alone and combination, there ammonium phosphate, ammonium nitrate.
Boron-based flame retardant materials. Top hydrated zinc borate, generally used in conjunction with other flame-retardant materials. Other metal oxides, such as aluminum compounds, iron compounds such as metal, mainly used in smoke.
Organic flame retardant material
Organic halides. Mainly bromide, commonly used, decabromobiphenyl acid, tetrabromobisphenol, brominated polystyrene. Chloride, chlorinated polyethylene get together only paraffin application. Halides often used in conjunction with antimony trioxide or phosphide.
Organic phosphorus compounds. Inorganic phosphorus (V) can be divided into two types of halogenated phosphorus. Halogen-free phosphorus mainly for categories such as triphenyl phosphate, and so on. Halogen-free phosphorus and phosphorus halides to be joined together. Phosphorus halide in the molecule containing both phosphorus and halogen two elements, a synergistic effect intramolecular, which can be used alone,

Common species such as trichlorethylene. ③ nitrogen system. There are three main varieties of poly-nitrogen and ammonia, commonly used in PA and PU in collaboration with the use of phosphorus-based flame retardants.

Aluminum hydroxide, magnesium hydroxide and the difference

Thermal decomposition temperature of magnesium hydroxide 340 ℃, high
aluminium hydroxide than 100 ℃, the temperature is conducive to the improvement of plastic processing, extrusion speed to accelerate and improve the plasticizing effect, shorten the molding time, the product surface gloss, does not produce surface defects, while ensuring a super

A strong peel strength.
Particle size distribution, good compatibility with the substrate, little effect on the mechanical properties of products.
Magnesium hydroxide, magnesium oxide combustion generated after dehydration is a high strength, high heat resistant material, can be used as a protective wall, separated from fire, toxic gases, magnesium hydroxide with an acid neutralizing capacity, and can be quickly neutralize plastic acidic gases produced during combustion SO2,

NOx, CO2, etc.
High decomposition of magnesium hydroxide flame retardant, high efficiency, smoke suppression ability, low hardness, low friction of the equipment that helps extend equipment life.
Inexpensive, aluminum hydroxide, magnesium hydroxide is half the price, filling capacity, can greatly reduce the cost of the product.