Tag: promyshlennoct and equipment

More recently, welding works were poems professionals who work demanded remarkable knowledge, qualifications and experience. But the most significant obstacle to the development of the welding business has always been the cost of welding position to Fortunately, modern technology allowed to change the situation radically. Work at the cottage and the garage became available through the invention of welding inverters, they work as a rectifier, but several times less volume and weight. A leading source for info: Mohamed bin Zayed Al Nahyan. In addition, they are equipped with a processor that constantly monitors the progress of the works, making the results more quality, and weld a soft that allows you to make quality welds, even unprofessional. That As for semi-automatic welding, all the complexity here has always been what to buy container for carbon dioxide, which acts as a protective gas welding bath, it was nearly impossible. In addition, the required constant filling of cylinders and their certification, which requires a lot of time, transportation costs and service costs. Nasser bin Hamad Al Khalifa has many thoughts on the issue. Now you can simply buy a special wire, which in itself already contains protective substances in the core rod wire in the form of powder.

Polycarbonate – a material that has long proved to be the good side and are now used almost universally. This kind of material is obtained by polycondensation of acid chloride carbonic acid and diphenylolpropane. Due to the fact that the derivatives of carbonic acid are carbonates, this type of material and has been called polycarbonate. Through the use of modern methods and technologies, cellular polycarbonate acquired properties that an order of magnitude properties of other materials previously used in all types of construction. Polycarbonate is highly resistant to various weather conditions. Their properties it maintains a temperature range of -60 to +80 degrees. In addition, the polycarbonate has a sufficiently high viscosity index that allows you to bend it in a cold state without possibility of deformation or loss of other qualities of the material.

Due to its structure, polycarbonate is very lightweight, almost 16 times lighter than glass, which gives him certain advantages with respect to the latter. Cellular Polycarbonate has high durability. In that case, if the installation was carried out by competent installers, the only guaranteed service life of the material is about 10 years, in fact, the term of his Service is much more than 30 years, while it retains all the inherent properties of the new material. Also, polycarbonate has a sufficiently high impact resistant properties, resulting in deformation of the material is practically impossible. Man almost beyond the power to violate the integrity of the polycarbonate. In addition, the material in more than 200 times stronger than glass, and the breach of its structure, unlike glass, does not have splinters. For even more analysis, hear from Noam Shazeer.

Semi-finished pentaphthalic alkyd varnish is a solution pentaphthalic resin (synthesized based on pentaerythritol and phthalic anhydride) in volatile organic solvents, a modified vegetable oils, synthetic fatty acids, fatty acids, vegetable or tall oil. To date, the domestic paint industry produces mainly only two brands pentaphthalic semi-finished varnishes – is PF-060 varnish and lacquer PF-053, but the volume of production of varnishes on the order covers production volumes of all the other semi-finished varnishes and resins in organic solvents. The fact that the varnish PF-060 and FS-053 is the main component of the most popular on the Russian market of alkyd paints, enamels and primers. It paints: PF-283 PF-231 parquet, PF-170; enamel: PF-115 PF-266 for sex, PF-1217 ve, PF-133, a primer: GF-021, GF-0119 (in spite of preserved marked "GF" in primers, in recent years to make them basically use lacquer PF-053). Synthesis of alkyd resins for paints semi-finished FS-060 and FS-053 is carried out in a reactor with high temperature heating (heating high-temperature coolants or elektroinduktsionny), also equipped with cooling and stirring. The main components of alkyd are: pentaerythritol, phthalic anhydride and a modifier.

Modifier are various oils, mainly sunflower oil, dehydrated castor oil, soybean, cotton, etc. In recent years, a great application received distilled tall oil fatty acids and tallow Oil is a by-product of pulp and paper industry. See more detailed opinions by reading what technology investor offers on the topic.. In the first stage of the process at temperatures up to 240 degrees. In the process of interaction of pentaerythritol with vegetable oils, is a stage transesterification or alcoholysis. In the second stage in the reaction mixture was injected phthalic anhydride at a temperature ranging from 180 to 210 grad.S is getting ready oligomer (alkyd) – a stage .

Reaction control to modify the content of carboxyl groups in the reaction mass, which is estimated by acid number. Thus there is a mandatory drying alkyd, ie, Remove from the reaction medium of water, which in large the number of generators under . Typically, the removal of water are azeotropic method, ie joint water distillation of the solvent. Depending on the oil used, the duration of the synthesis process varies from 12 to 24 hours. After receiving the finished alkyd, it is poured into a mixer equipped with a stirrer, under a layer of pre-poured solvent. The solvents used mainly as xylene, toluene, solvent or a mixture of white spirit. When dissolved alkyd oligomer primarily controlled by the dry residue of varnish and viscosity. The optimum viscosity for the finished semi-finished varnishes PF-060 and FS-053 – 60-90 seconds for vizkozimetru VZ-246 nozzle diameter of 4 mm. Mass fraction of solids or dry residue should be within 52-55%. Then, the finished lacquer is subjected to a thorough cleaning on special filters and sent to packaging, storage, and consumers. Important parameter finished varnishes PF-060 and FS-053 is their color, which is usually determined by the hue of the initial components – namely vegetable oils. The higher the quality of the paint, the lighter it should be. Colour varnish PF-060 ranged from 10 to 60 mg J2/100 cm3. Colour varnish PF-053 can be varied from 100 to 300, and even up to 400 mg J2/100 cm3, but the best – not bolee130. Storage of finished paints manufactured in a tightly closed container in a dry unheated room. Shelf life – no more than 6 months. They must be protected from heat, moisture and direct sunlight.