PE Lay Flat Hose Impact Resistance
PE Lay Flat Hose Impact resistance
Impact-resistant polystyrene (HIPS) is an impact-resistant polystyrene product produced by adding polybutyl rubber particles to polystyrene. This polystyrene product adds micron-sized rubber particles and connects the polystyrene and rubber particles together by means of branching. When subjected to impact, the crack tip stress is released by relatively soft rubber particles. So that the expansion of the crack is hindered and the impact resistance is improved.
Polystyrene is a widely used brittle plastic. The shell of the computer you are using is polystyrene. Transparent plastic cups, packaging foam is made of polystyrene. Polystyrene belongs to the polyolefin and is made by free radical polymerization of styrene. A new type of polystyrene, syndiotactic, can be obtained by metallocene catalyzed polymerization. The benzene rings on the polystyrene are alternately connected to both sides of the main chain, and the benzene ring of the ordinary polystyrene is randomly connected to both sides of the main chain. The syndiotactic is a crystalline polymer with a melting point of 270 ° C. Polybutadiene was added to the styrene polymerization system to polymerize the styrene on the polybutadiene backbone. Polystyrene and polybutadiene are incompatible, so that the styrene and butadiene segments are aggregated to produce phase separation. These polybutadiene phases can absorb the impact energy, thereby increasing the impact strength of polystyrene HIPS engineering plastics milky white opaque particles with a density of 1.05g / cm ^ 3. Melting temperature 150 ~ 180 ℃. Thermal decomposition temperature 300 ℃. Soluble in aromatic hydrocarbons, chlorinated hydrocarbons, ketones (except ketone) and esters. Can withstand many mineral oil, organic acids, alkali, salt, lower alcohols and its aqueous solution, intolerant boiling water.
HIPS is one of the cheapest engineering plastics, and ABS, PC / ABS, PC compared to the material is relatively poor gloss, comprehensive performance is relatively poor. HIPS is modified by the PS plus butadiene, because PS impact strength is very low, the product is very brittle, but the toughness of butadiene is good, after adding butadiene PS impact performance can be increased by 2 to 3 times.Although the HIPS impact strength than the impact strength of PS Much higher, but its overall performance is still not as good as ABS, PC / ABS, etc. HIPS impact performance in engineering plastics is relatively low, so we use this material should pay attention to the impact of the material test.
475 is HIPS
That is, high impact polystyrene, in order to meet the requirements of tough materials, 1950 began to develop rubber modified polystyrene (high impact polystyrene that HIPS). By adding the rubber to the polystyrene substrate, it is possible to produce high impact polystyrene having various grades with different properties. In recent years, has developed a variety of special grade HIPS, has a flame retardant, anti-stress cracking level, high gloss level, high impact strength level, glass fiber reinforced grade and low residual volatilization grades, etc., they are in many applications The field has been able to compete with expensive engineering resins. The impact resistance of polystyrene is characterized by ease of processing, excellent dimensional stability, high impact strength and high rigidity. For HIPS only in heat resistance. Oxygen permeability, UV stability and oil resistance have a certain limit. Chemical and Properties Impact-resistant polystyrene is prepared by dissolving the poly-diene rubber in the styrene monomer prior to the polymerization reaction. Although the HIPS can be used to produce HIPS, but the current production of HIPS is mainly used in bulk polymerization method. In the bulk polymerization process, the styrene monomer / rubber / additive mixture through a series of reactors, conversion rate of 70 ~ 90%.
Other important properties of the standard HIPS are as follows: bending strength 13.8 ~ 55.1MPa; tensile strength 13.8-41.4MPa; elongation at break 15-75%; density 1.035-1.04 g / ml ; Vicat softening point 185-220 ° F.