Titanium
A metal elements, gray, in the combustion of nitrogen, high melting point. Blunt titanium and titanium-based alloys to the new structure of materials, primarily for industrial and aerospace navigation industry.
Found elements from titanium to a pure system, which lasted more than a century. The use of titanium to be true, would have recognized their real face, it is the 1940s after the matter.
Geography 10 km thick on the surface of the formation, with up to six thousandths of titanium, copper and more than 61 times. Just start from the ground floor of a mud, which contain a few parts per thousand of titanium, the world's reserves of more than 10,000,000 tons of perovskite is not uncommon.
Success on the beach million tons of gravel, titanium and zirconium than these two heavy mineral sand, gravel mixed in, after millions of years of sea water washing around the clock, compared to heavy and ilmenite Zircon red sands together in a long coast, a form of a perovskite-seam and zirconium. This is a seam of black sand, there are usually a few centimeters to several dozen centimeters thick.
No magnetic titanium, titanium used in the construction of nuclear magnetic mines without fear of attack.
In 1947, people began to titanium smelter in the factory. At that time, only the output of 2 tons. 1955 to increase annual production of 20,000 tons. In 1972, annual output reached 200,000 tons. The hardness of steel and titanium or less the same, but it is only with the weight of almost half the size of the iron and steel, titanium aluminum although a little more than a little heavy, and its hardness than 2 times as large aluminum. Now, in the universe of rockets and missiles, with a large number of titanium instead of steel. According to statistics, currently the world each year for the space of titanium, has reached more than 1000 tons. The very fine titanium powder, or a good rocket fuel, so the universe as titanium metal, the metal space.
The heat-resistant titanium well as high melting point of 1725 ℃. At room temperature, titanium can be safe to lie on the strong base of a variety of strong acid solution. Even the most ferocious of acid - Wang Shui, it is not corrosion. Titanium not afraid of the sea, the Shenyang was once a piece of titanium to the bottom, five years after taking up a look at the top, stick a number of small animals and plants Harbor, but that does not rust, is still the shining light.
Now, people began to use titanium to make a submarine - a submarine of titanium. As the titanium is very strong, can withstand high pressure, the submarines can be as deep as 4,500 meters deep-sea sailing

Polypropylene PP
Typical applications:
The automobile industry (mainly the use of metal additives PP: fender, ventilation pipes, fans, etc.), appliances (dishwasher door liner, the ventilation tube dryer, washing machine and the framework to build a refrigerator door gasket, and so on), Japan With consumer goods (such as lawn and garden equipment
Water and grass-cutting machine, etc.).
Injection Molding Process:
Dried: If you do not need to store the appropriate season.
Melting temperature: 220 ~ 275 ℃, attention should not exceed 275 ℃.
Die temperature: 40 ~ 80 ℃, recommend the use of 50 ℃. The degree of crystallization of the major decisions by the mold temperature.
Injection pressure: large 1800bar.
Injection speed: In general, the use of high-speed injection molding so that the internal pressure can be reduced to a minimum. If the products appear on the surface of the defect, then use a higher temperature under low-speed injection.
Runner and gate: cold, the typical flow range is the diameter of 4 ~ 7mm. Recommended for the species round the entrance and note the flow. All types of gate can be used. Typical of the gate diameter range is 1 ~ 1.5mm, but can also be used as small as 0.7mm of the gate. The edge of the gate, the smallest depth of the gate for half of the wall; the smallest width of the gate should be at least twice the thickness. PP material can be used hot runner systems.
Chemical and physical properties:
PP is a semi-crystalline materials. PE more than it should be hard and have a higher melting point. As the homopolymer PP-temperature higher than 0 ℃ over time is very brittle, so a lot of business to join the PP material is 1 to 4% of the ethylene random copolymer or a higher ratio of ethylene copolymers content of the clamp-piece. PP copolymer-based material has low heat distortion temperature (100 ℃), low transparency, low-gloss, low-rigid, but there is an even stronger impact strength. With the strength of the PP content of ethylene increases. The PP Vicat softening temperature of 150 ℃. Due to the higher crystallinity, the material on the surface of the stiffness and good anti-scratch characteristics. PP does not exist environmental stress cracking problem. In general, adding the use of glass fiber, metal or thermoplastic rubber additives on the way for modified PP. PP turnover of the MFR in the range of 1 to 40. MFR's low-impact PP material properties, but better to extend a lower intensity. MFR for the same material, the strength of co-than-dimer were higher. As the crystallization, PP of the high rate of contraction, usually 1.8 to 2.5 percent. Shrinkage and the direction of uniformity than the PE-HD, and other materials are much better. By adding 30% of the glass so that the additives can be contracted rate fell to 0.7 percent. Homopolymer and copolymer PP-based materials have good anti-moisture absorption, anti-corrosive acid, anti-solubility. However, its aromatic hydrocarbons (such as benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride), and so no solvent resistance. PP did not like PE is still at a high temperature oxidation resistance.
Polypropylene (PP) is a common plastic in a lighter, the electric performance as a high-frequency heat-resistant insulation applications. PP is a crystalline polymers, melt due to condensation than the volume, with a high degree of molecular orientation and a larger shrinkage (1.0% -1.5%). PP in the molten state, to reduce the temperature of its viscosity is very limited. Therefore, in the process of forming, should be to improve the injection pressure and shear rate mainly to improve the quality of molding roducts.

ABS plastic
Features:
1, better performance, high impact strength, chemical stability, good electrical properties.
2, with 372 of the plexiglass of a good weld, made of two-color plastic pieces, and the surface can be chrome, paint handling.
3, high-impact, high heat, flame-retardant, enhanced level of transparency and so on.
4, the liquidity ratio almost HIPS, PMMA, PC, and so on, and good flexibility.
5, use: suitable for the production of general machinery parts, friction wear-resistant parts, transmission parts and telecommunications parts.
6, with PVC (polyvinyl chloride) in the same inflection whitening phenomenon will occur.
Forming characteristics:
1. Amorphous material, liquid medium, moisture absorption, must be fully dry the surface gloss of the requirements of plastic parts to be dry 80-90 warm-up for a long time, 3 hours.
2. Advised to take High-temperature materials, high-temperature mode, but the high temperature expected to easily break down (decomposition temperature of> 270 degrees). On the high precision plastic parts, mold Wenyi take 50-60 degrees, high-gloss. Resistant Pieces of thermoplastic, Wen Yi-mode take 60-80 degrees.
3, to resolve For Shuiwen folder, to be material to enhance the mobility of high-temperature materials, high-temperature mode, or to change the water level and so on.
4, such as forming heat-resistant or flame-retardant grade materials, the production of mold on the surface would be 3-7 days after the remnants of plastic materials break down, resulting in mold on the surface illuminated, on the need to clean up mold in a timely manner and at the same time need to increase the mold surface location of the exhaust.
ABS resin production is the largest and most widely used polymer, it will PS, SAN, BS various properties are naturally united, both tough and hard, just and balanced with good mechanical properties. ABS is acrylonitrile, butadiene and styrene copolymer, A representative of the PAN, B on behalf of butadiene, S on behalf of the styrene.
ABS engineering plastics are generally non-transparent, the appearance of ivory Light, non-toxic, odorless, both tough and hard, just the characteristics of slow burning, yellow flames, smoke, burning plastic softening after, charred, issued a special The cinnamon smell, but no molten drop phenomenon.
ABS engineering plastics have excellent performance, excellent impact strength, good dimensional stability, electrical properties, wear resistance, chemical resistance, dyeing, molding and machining process better. ABS resin water, salts, acids and alkali, insoluble in most of the alcohol and hydrocarbon solvent, and easily soluble in aldehydes, ketones, esters and some of chlorinated hydrocarbons.
ABS engineering plastics shortcomings: low heat distortion temperature, the combustible, poor weather resistance.

Resin
Resin usually refers to the heat after the scope of softening or melting, softening at the tendency to flow under external force, is solid at room temperature, semi-solid, and sometimes it could be a liquid organic polymer. Strictly speaking, is a phenolic resin chemical structure, there are many types of widely used in our heavy industry and light industry, our day-to-day life are often the time, such as plastics, resins glasses, paint, rosin.
Resin natural resins and synthetic resins division. Is the natural resin from the natural world of animals and plants in secretions from the amorphous organic matter, such as rosin, amber, shellac, and so on. Synthetic resin, is defined as a simple organic chemical synthesis or by some natural products chemistry has been the product of the resin.