What are the Properties of Insulation Board?

Insulation board has been widely applied in the present building, with good moisturizing properties and thermal insulation, it is a low thermal conductivity material, the compact honeycomb structure, thereby effectively preventing heat conduction.

Insulation boards with high compressive strength properties, high compressive strength insulation board, but if you let it bubble for a long time still remains unchanged, with good impact resistance and great carrying capacity. Insulation board has excellent resistance to water, moisture resistant. Insulation board with a tight closed-cell structure, Expanded Polystyrene molecular structure itself does not absorb water, positive and negative plates are no gaps, and therefore very low water absorption, excellent moisture-proof and anti-permeability. Good flexibility insulation board wall deformation can be absorbed, affected by the expansion and contraction of the wall structure, there will be some distortion, EPS can be well absorbed by the deformation, and softer EPS special sandpaper sheet available at the seams polished so smooth look more unified. Lightweight insulation board, high hardness, low cost and convenient construction. Bearing capacity of the structure does not affect when fully closed-cell foam insulation board to form a lightweight structure, and uniform honeycomb structure makes high hardness, so unbreakable, easy to transport, install, lightweight, easy to cut, used as roof insulation.

The applications of Expanded Polystyrene EPS:

Expanded Polystyrene EPS can be used for packaging materials, it has the advantages of lightweight, non-toxic, have a certain flexibility, may molding, and is cheap. EPS can be widely used in a variety of precision instruments, meters, valuables, aquatic products, fruits and other packaging.

Expanded Polystyrene can be used as external wall insulation for buildings, can be composed by Flame Retardant Expanded Polystyrene Foam sheet, adhesives and overlay material, can play the role of energy-saving insulation.

Expanded Polystyrene EPS can be used for decorating style, EPS foam is light, easy cutting, carving, made from a variety of complex models that begin bonding. EPS is widely used in exhibitions, shop decoration, modeling materials, can also be used to produce a variety of teaching models.

EPS can be used for pipe insulation, EPS is non-toxic, non-corrosive, lightweight, insulation, molding, anti-acid corrosion, it can be used for various purposes pipe insulation.

EPS can be used for ground insulation, high-density polystyrene foam board with high strength, can withstand a certain load, thermal insulation, can be used for cold storage of flooring materials.

Expanded Polystyrene EPS can be used for roof insulation, EPS foam board in combination with other roofing materials together to form a roof covering system, you can play insulation, energy saving effect.

Vanadium and Vanadium Alloy Applications

Electronics Industry:

For Vanadium-containing superconductor material, used as X-ray filters in tubes, vanadium-containing high-capacity batteries used for small-scale use of military power and other artillery fuzes, and has repeatedly charged, long life and other advantages.

Agriculture:

Promote crop growth, yield, increase nitrogen fixation plants, increase nitrogen content, vanadium salt into the soil or sprayed plants or seed treatment. Because of the role of vanadium, phosphorus and potassium makes the plant content increased.

Biology:

The last century has seen something in plants containing vanadium, such as Amanita Tan, Tube Cucumber. Some scientists believe that, Vanadium in Tube Cucumber blood is involved in the digestive process, rather than the process involved in breathing. In Argentina, experimented feed to cattle and swine by adding a vanadium compound, as a result, the animals can improve appetite, weight increased rapidly. In addition, Aspergillus niger only in the presence of Vanadium Salt to normal growth.

Steel Industry:

Vanadium has the effect of deoxidation, denitrification in steel, can improve the properties of steel, most of the Vanadium Additive ingredients for steel, to produce high-strength low-alloy steel, high speed steel, tool steel, stainless steel and permanent magnets. Containing vanadium steel with high strength,toughness, wear resistance, corrosion resistance and good features. Widely used in the production field machinery manufacturing, automotive, aerospace, railways, bridges and so on.

Vanadium Titanium:

Vanadium in Vandium Titanium is a potent stabilizer, can improve the crystalline structure of the alloy, improve the high temperature stability, heat and cold resistance. Vanadium Titanium is light weight, high strength characteristics, mainly used in aircraft engines, space in the cabin skeleton, missile warning search boxes. Also to be used aspects armor, artillery and armor personnel and medical prostheses, automobiles, ships and so on.

Cobalt and Nickel-based alloys are corrosion-resistant materials, Niobium-Tantalum alloy with good superconducting properties, for the space shuttle and satellites and missiles.

The Application of Polyvinyl Alcohol PVA in Spinning Industry

The range of application of Polyvinyl Alcohol is very wide, usually it is used in spinning industry. Polyvinyl Alcohol can be used as vinylon material. Polyvinyl Alcohol can obtained the vinylon fibers sfter dissolution, spinning and the treatment of acetalization, we can obtained the vinylon textiles after blending with cotton, wool, viscose fiber, and it is widely used in clothes, cord, rope nets and so on. The raw material for the manufacture of towels roughly divided into cotton fiber towel and blended towel. And nowadays, the water soluble PVA fiber also has some development in cotton fabric. Water soluble PVA fiber means the fibers can be dissolved in water or water- soluble molecules slowly hydrolyzed(or compounds), is a kind of valuable functional differential fiber. With the growing awareness of environmental protection, non-toxic, non-polluting and environment-friendly soluble fiber hydrolysis applications to get the increasing popularity of such fibers are constantly developed further, it will be widely used. The water soluble PVA fiber can be used to produce untwisted towels. The untwisted towel is the high-quality goods in a towel product. It is very soft, and moisture absorption of it is particularly good. The reason why traditional toweling poor moisture absorption and feel stiff is to adapt to the needs of the textile processing, given the large loop warp twist yarn structure to make that more closely. But the water soluble PVA fiber is not only has the desired water dissolution temperature, strength and elongation, has the good acid and alkali resistance, and resistance to dry and heat. And it is non-toxic, odorless and can be soluble in water. The aqueous solution is colorless transparent, it can be biological degradation of the environment and does not produce any pollution in a short period of time. And it is a kind of great value of the green fibers.

The Characteristics of Tungstic Acid

The Synthetic of Tungstic Acid:

Calcium Tungstate – hydrochloric acid decomposition method wolframite crushed and sodium hydroxide, generating sodium Tungstate solution by filtration, purification, and then with the calcium chloride solution metathesis reaction to obtain calcium Tungstate, and then hydrochloric acid, After washing the resulting Tungstic Acid, dried and pulverized to obtain Tungstic Acid product. Hydrochloric acid decomposition method wolframite after alkaline hydrolysis with sodium hydroxide, hydrochloric acid, ammonium chloride solution with filtered, washed through, get refined ammonium Tungstate solution, hydrochloric acid solution and then get Tungstate, and then by dehydration, drying, grinding, that was finished Tungstate.

Tungstate using hydrochloric acid decomposition. A saturated aqueous solution of Sodium Tungstate Na2WO4, calcium Tungstate CaWO4 like Tungstate heating, the solution was slowly added dropwise to a molar ratio of 2 to 3 times the amount of boiling concentrated hydrochloric acid. According to the above reaction precipitated yellow Tungstate. Then if dropping too fast or fluid temperature drops, it is easy to generate a suspension-like or colloidal precipitation, to further processing difficult. After dropping on a water bath heating was continued 1h, the precipitate becomes easy filtration, washed with 5% aqueous solution of ammonium nitrate was washed several times, will be completely removed upon standing Cl-. After filtration and dried at 120 ℃.

The Properties and Stability of Tungstic Acid:

If used and stored according to specifications will not decompose. Slightly soluble in water, soluble alkali, hydrofluoric acid and ammonia, almost insoluble in acid.

100 ℃ start dehydration, boiling point 1473 ℃. High temperature burning into Tungsten Trioxide. Insoluble in water and most acids, slightly soluble in water, soluble alkali, hydrofluoric acid and ammonia. N-Tungstic Acid or secondary Tungstate solution to dilute acid treatment available colloidal Tungstic Acid, containing different amounts of water, the water solubility and activity than the large yellow Tungstic Acid. Powdery white Tungstate activity compared with the big yellow Tungstate. Tungstate solution can be added to a solution of dilute nitric acid role in the system.

Yellow Tungstic Acid used in the manufacture of Tungsten metal powder, powdered white acid can be used to prepare the partial Tungstate and Tungsten-containing heteropolyacid salt.

Basic Situation of Silicone Rubber

The basic structure:

Such as nitrile rubber (NBR), styrene-butadiene rubber (SBR), isoprene rubber (IR) and natural rubber (NR) and so a carbon – carbon bonds polymer chains present on the unsaturated bonds in its molecule, but the Silicone Rubber repeating the conversion arrangement of the chain and a silicon atom through an oxygen atom in its main chain is not an unsaturated bond. In terms of the organic polymer, the unsaturated bond is a chemical vulcanization active area, and this area due to effects of ultraviolet radiation, ozone, light and heat degradation.

silicon – oxygen bonds of high bond energy, and the basic structure is completely saturated peroxide cured Silicone Rubber is to maintain the good weather resistance and heat resistance properties of the key. In addition to higher bond energy of the carbon atoms, the silicon atoms have a greater freedom to provide greater space, so that the Silicone Rubber of low glass transition temperature, better air permeability performance. Depending on applications, the advantages of air permeability may also be a disadvantage.

Types of Silicone Rubber:

Side by various functional groups bonded to silicon atoms way classification, Silicone Rubber include: methyl Silicone Rubber (raw material production products), methyl vinyl Silicone Rubber (integrated applications, compression good performance), phenyl methyl vinyl Silicone Rubber (temperature, thermal radiation stability), and trifluoropropyl methyl vinyl Silicone Rubber (chemical synthesis, the temperature range -62-191 ℃). ASTM D-1418 Application abbreviated as:

Q– associated with alternative functional groups of the polymer chains of small Silicone Rubber;

MQ– only silicone elastomers containing methyl-related functional groups in the main chain;

PVMQ– containing phenyl , vinyl, methyl functional groups Silastic;

VMQ– containing vinyl, methyl functional group of the Silicone Rubber;

FVMQ– fluorinated alkyl, vinyl, methyl functional group of the Silicone Rubber;

PMQ– in containing methyl, phenyl functional groups on the main chain of the Silicone Rubber.

ASTMD-2000 in the type and application of abbreviations, the first letter indicates the temperature range, the second letter expressed ASTM 3 oil resistant expansion properties:

FC– high-strength Silicone Rubber;

FE– high strength and high heat resistance of Silicone Rubber;

FK– fluorosilane Silastic;

G– generally used in high temperature Silicone Rubber.

The Properties and Mechanism of 1,2,3-Benzotriazole

1,2,3-Benzotriazole content, fewer impurities species, 1,2,3-Benzotriazole premise can be water-soluble, the higher the content, the higher solubility, the less the amount added. Water, meaning that water, oil, is the solvent include ethanol, benzene, toluene, chloroform and N, N- dimethylformamide.

For anti-rust oil (fat) categories of products, anti-corrosion effect on copper and its alloys, silver and its alloys are particularly evident, and more for copper and copper alloy vapor phase corrosion inhibitor,

Circulating water treatment agent, automobile antifreeze fluid, photographic fogging agent, polymer stabilizers, plant growth regulators, lubricating oil additives.

Phenylpropanoid Tolyltriazole also be used as preparation for chrome fog briefly chrome industry, and prevent harm chrome fog. Increase the brightness plated pieces.

This product also can be used with a variety of scale inhibitor, biocide used in conjunction.

Phenylpropanoid Tolyltriazole also excellent UV absorber, the absorption wavelength 290-390 nm. Can be used for outdoor paint additives, pigments fade significantly lower (Tu) material damage caused by ultraviolet rays.

1,2,3-Benzotriazole is an organic heterocyclic compounds, their appearance is pure white needle crystal, while commodity 1,2,3-Benzotriazole mostly white or yellow, purity is generally 95% to 98%. 1,2,3-Benzotriazole can be dissolved in water, and the solubility increases with increasing temperature, which range at room temperature 20 ~ 30 ℃, its solubility in the range of about 1.5 percent to 2.3 percent. 0.1% aqueous solution of 1,2,3-Benzotriazole is slightly acidic, pH value between 5.5 and 6.5, 1,2,3-Benzotriazole solubility in polar solvents greater solubility in non-polar solvents small. Its vapor pressure is relatively large. Benzotriazole toxicity smaller, usually inorganic corrosion inhibitors compared with the commonly used sodium nitrite toxicity equivalent to only 20% of sodium nitrite, chromic anhydride with copper and copper alloy passivation process used or chromate compared to its less toxic. 1,2,3-Benzotriazole has greater solubility in acid and alkaline solution in. Domestic synthetic 1,2,3-Benzotriazole derivatives have eight and dodecyl 1,2,3-Benzotriazole, etc., all have good corrosion protection. reactive groups and the corrosion process

1,2,3-Benzotriazole molecule generated by the interaction of metal ions to form insoluble precipitates with the film or film on the metal surface to form a precipitate further polymerized protective film, thus preventing the corrosion process. Benzotriazole

benzene and derivatives on copper or copper alloy with unique and excellent corrosion properties. Its corrosion protection mechanism: in the 1,2,3-Benzotriazole solution, the solid-liquid interface of the copper substituted at a 1,2,3-Benzotriazole NH functional groups of molecules of hydrogen atoms connected by covalent bond, and with another 1,2,3-Benzotriazole nitrogen atoms in the molecule of free electrons to form a coordination bond connected to a semi-permeable polymeric complex. Such polymer films stable complex and insoluble in many solvents solution, has good corrosion protection.

1,2,3-Benzotriazole protective role for anti-tarnish silver or silver plating is also based on the complex causes of polymeric film formation.

1,2,3-Benzotriazole aluminum tin, zinc cadmium also has good corrosion inhibition, mainly due to cadmium and zinc ions precipitate thin film formed on the surface, which can effectively prevent the zinc and cadmium oxide formed on the surface and corrosion.

The Operational Characteristics of Silicone Rubber Material

In addition to running characteristics of Silicone Rubber material for composite insulators, Silicone Rubber materials in the system run a lot, mainly due to the following characteristics:

High and low temperature resistance, acid and alkali and resistance to contamination. It can be applied in different working environments, especially the dirty areas, can effectively avoid the occurrence of flashover.

It has good corrosion resistance, good insulating properties, and the service life of it is long.

Silicone Rubber has low surface energies, that is excellent hydrophobic properties, and drops on the Silicone Rubber surface can fall at any time, does not form conductive water film, so as to avoid the occurrence of surface flashover.

Silicone Rubber has specific hydrophobic mobility. In the long run, Silicone Rubber surface will be a lot of filth, excellent hydrophobic properties of Silicone Rubber can be migrated to a dirty surface. So at runtime can be maintenance-free.

Although Silicone Rubber with excellent characteristics of the above, with yearly increase in use of Silicone Rubber composite insulators, my information about composite Silicone Rubber deterioration and damage increasing. Decreased mainly in hydrophobicity of silicone rubber material, show some deterioration, flashover or equipment damage caused by accidents.

Most Silicone Rubber have varying degrees of flammability. Containing halogen in the molecules of rubber into neoprene, Viton, it has a certain degree of fire resistance. Therefore, the neoprene glue containing chlorine atoms sulfonated poly vinyl chloride after removing external flame, even burning is difficult, and fluoroelastomers is self extinguishing. Adding flame retardant in a compound (such as phosphates or halogen-containing substances) can increase its flame resistance.

Silicone Rubber at low temperature must be used with particular attention to the influence of volume shrinkage, such as oil seals will leak because of contraction, Silicone Rubber to metal bonded products due to shrinkage of early damage caused by excessive stress.

The Latest Market Situation of Vinyl Acetate Monomer VAM

There is a sharp rates of European Vinyl Acetate Monomer. German chemical company Wacker Group announced on June 24, as WACKER PVAc in the production of solid resin is the raw material of Vinyl Acetate Monomer VAM with high cost, they will rise the global range of food-grade Polyvinyl Acetate Phthalate (PVAc) sale price. This time would increase the price of 30%, or according to the customer of the contract accordingly. This price increase will be effective immediately and continuing until further notice.

‘In the past six months, sharp rise in the price of Vinyl Acetate Monomer, and now, Europe has almost doubled the price one time. And before the situation eased in the raw materials market, we have to go in a food-grade PVAc Resin Solids on the basis of the selling price surcharge, to a certain extent offset rising raw material costs. Although we have been working to optimize the cost structure and productivity, in the current market price is inevitable. ’ Wacker Biotech bubble gum Business Director Christian Hauk explained.

Liwei Chemical Co.Ltd is located in Tianchang, Chuzhou, Anhui province. It is a subsidiary of Sinochem Coporation and the biggest supplier of Polyvinyl Alcohol. It was founded in 1950. It has the latest and most advanced production technology, and it is also a professional manufacturer of producing Polyvinyl Alcohol PVA series products with advanced technology. The major products of the company are as following: PVA Polyvinyl Alcohol, PVA fiber, Calcium carbide and Vinyl acetate. The PVA Polyvinyl Alcohol is widely applied in textile, building, papermaking, packing, timber processing, agriculture, printing, polymer chemical, ceramic, iron and steel, electronic, electrolytic, electroplating and other industries. As excellent synthetic fibers, it can also be spun and acetalized to make vinylon fiber.

We will provide high quality chemical products, service customers in the round, improve service quality through prove the professional level and unremitting efforts.

The Natural Rubber and Silicone Rubber

Natural Rubber:

Natural Rubber is polyisoprene vivo biosynthesis, modulus of elasticity of steel is about 1/30000, and the elongation is of 300 times of the steel. Natural Rubber is a crystalline rubber, with self-reinforcing nature, with very good mechanical strength. Natural Rubber has a good air tightness. Natural Rubber has good alkali resistance, but impatience acid. Natural Rubber is a kind of non-polar rubber, so only some of the polar solvent resistance, and in the expansion of non-polar solvent, the non-polar solvent and the oil is poor.

Because of the good performance of the Natural Rubber, it can be used alone made all kinds of rubber products, also with other rubber and used to improve the performance of other rubber, such as the molding viscosity, tensile strength and so on, thereby improveing the overall performance of rubber products. Natural Rubber is widely used in tires, hoses, tape and various industrial rubber products.

Silicone Rubber:

Silicone Rubber forming the main chain composed of silicon and oxygen atoms, side chain are carbon-containing group, the largest amount is the side chain of ethylene Silicone Rubber. Silicone Rubber has both the heat and cold properties, to make the temperature is around 100 to 300 ℃, it has excellent weather resistance and ozone resistance and good insulation. The disadvantage is that low intensity, poor tear resistance, abrasion resistance is also poor. Silicone Rubber is mainly used for the aviation industry, electrical industry, food industry and medical industry and so on.

What is Reactive Dye?

Reactive Dyes, is a class of dyes in dyeing with fiber chemical reaction. This kind of dye molecules containing the groups wich can react with the fiber. Dyes and fibers reactive when dyeing, the formation of a covalent bond between the two, as a whole, and improving the washing fastness and rubbing fastness. Reactive Dye is a new class of dyes. Reactive Dye molecules including dyes and reactive group of two main components, fiber and reactive group known as the active medium. There are chemically active groups in Reactive Dye molecules, molecules containing chemically active groups, reaction in aqueous solution with cotton, wool and other fibers were formed on dyes. Reactive Dye has high washing fastness.

The advantages of Reactive Dye:

Reactive Dye is combined with the parent dye, link based and reactive group, the covalent bond firnly combined with the fiber formation in use, and has the characteristics of a series of other cellulose fiber dye incomparable, established itself as the cellulose fiber dye for development and use of key position, prominently in the following four aspects:

Reactive Dye is one of the best choices to instead of banned dyes and other types of cellulose with dyes, such as: sulfur dyes, azoic dyes and vat dyes.

Reactive Dye for dyeing process to economic and simple operation to obtain the fast staining properties of high level especially wet fastness.

The chromatography of Reactive Dye is wide, with bright color, excellent performance, strong applicability, its color and the performance basically on fiber and clothing requirements and adapt the market.

Reactive Dyes for cellulose fiber products such as the need for Lyocell fiber dyeing.

The disadvantages of Reactive Dye:

The main technical problems of Reactive Dyes are as following:

The utilization rate of it is not high enough, usually is 60 to 70 per cent, produce a large number of colored water, its color ove thousands of times, the value of COD is 0.8 to 30 thousand ppm, the concentrated wastewater COD value is more than 50000 ppm.

In order to reduce the charge of the fiber surface, Reactive Dye used consumes a considerable amount of electrolyte. This not only increase the labor intensity, but also caused the concentration of chloride ion in waste water of up to about 100000 ppm, and greatly increased the difficulty of treatment of dyeing wastewater.

Certain color fastness can not meet the market demands, such as the sunlight fastness, perspiration fastness to wet rubbing and azo red dyes and azo blue dye in the light of the light fastness.

There are less varieties can replace the vulcanization vulcanized material and reducing dark Solvent Dyes.