HIPS

Thermoplastics > Styrenics

High impact polystyrene
Products range - (XSTIR H)
At Mexpolimeros we offer a wide range of HIPS resin and its compounds developed according to your needs, guaranteeing quality in products and service. Our range of products includes grades without reinforcement, with fiberglass and / or with mineral load (Ibridos), loaded with metals, with special additives such as heat stabilizer, UV, metals, antistatic, antibacterial, laser marking, nucleate etc, lubricant Special and flame retardant (with or without halogens). We are also developed and evaluated by highly qualified personnel with advanced technology.
What's HIPS?
The polystyrene resistant to the major impact is polystyrene / polybutadiene (S / B), which was the first to be synthesized. Impact-resistant polystyrene consists of the mixture of polystyrene and polybutadiene, the latter grafted onto the former. Styrene (C8H8), also known as vinylbenzene, is a clear liquid, very mobile and sweet-smelling. Its boiling point is 145 ° C, and it is stored with inhibitors that prevent its self-polymerization. Butadiene-1,3 (C4H6), is a colorless gas, liquefies at -4.4ºC, and is obtained from the C4 fraction of petroleum cracking or from natural gas, passing through the butane phase and dehydrogenation of this latest.
Symbols			Formula
HIPS termoplastico HIPS thermoplastic HIPS resin Poliestireno de alto impacto Thermoplastic HIPS HIPS thermoplastic HIPS resin High impact polystyrene
HIPS Properties
Extraordinary surface quality Excellent impact resistance at low temperatures Suitable for thermoforming Stability of the faces, to choose matte or glossy finish Great impression quality Outstanding electrical insulation properties Suitability for contact with food (except in the UV version) Very good processing property Copy mold details with great fidelity. Highly formable It does not corrode or emit toxic gases. 100% recyclable It can be printed by screen printing, offset and digital printing UV flat bed. Its use outdoors is not recommended.
HIPS Physical and mechanical properties
High impact polystyrene or synthetic shock have a better impact resistance than blends mixed at low temperatures. The impact resistance and other properties of the polystyrene can vary depending on the amount, type and distribution of the synthetic rubber in the polystyrene matrix, and through the rubber bonding on said matrix. S / B types with 3% rubber are considered to be fairly resistant to impact, with 3-10% considered high impact and 10 to 15% considered super resistant. The best resistance to stress cracking can also be achieved with the inclusion by polymerization of less than 10% acrylonitrile in the "matrix" or polystyrene binding support. Other options to modify the properties of the S / B are the substitution of butadiene for ethylene-propylene-diene rubber (improves the resistance to weathering) or the addition of no more than 10% of carbon black to the plastic, or of lamellae or metallic fibers, in order to increase the electrical conductivity.
Electrical properties
They depend on the percentage of water absorbed, good capacity as electrical insulator, good surface resistance and therefore good resistance to slip currents. They have dielectric losses at high frequencies, but excellent use at low frequencies. They have an electrostatic charge (attracts dust)
HIPS Optical properties
Impact-resistant polystyrene is practically opaque, due to the rubber particles it integrates. By using copolymers of styrene and butadiene or rubber components of refractive index similar to that of PS homopolymer, transparent types are achieved. Achieving an impact resistant and completely transparent polystyrene requires block copolymerization with rubbers in the form of thin sheets.
HIPS Chemical resistance
Generally good although it depends on the grade of the resin, the chemical concentration, temperature and efforts on the parts. It is resistant to oils, fats, formaldehyde, gasolines and hydrochloric acid. It is also not attacked by water chemically speaking.
HIPS Processability
HIPS granules are usually processed by injection molding, but due to the excellent processing of the material, other methods work equally well, including blow and vacuum molding, thermoforming, extrusion molding or compression and machining. As with common polystyrene (PS), HIPS can be 100% recycled, either by mechanical or chemical methods. In the first case, the waste that is obtained is usable in a large number of products, such as typewriters or seedbeds.
HIPS polimerization
Impact resistant polystyrenes are systems composed of two phases. A phase of hard polystyrene, matrix or binder, and a second phase of fine rubber particles and evenly distributed, within the first. These particles are what give the polymer its characteristic impact resistance. It is not easy to achieve the polystyrene and polybutadiene cohesion by mere mixing, because these homopolymers are not compatible with each other and, therefore, the mixture would not give a homogenous distribution. The butadiene / styrene copolymers (whose main chain consists of styrene and butadiene molecules) or butadiene / styrene graft copolymers (whose main chain consists of butadiene molecules and the side branches) are used as rubber starting materials. , grafted, are styrene). The portion of styrene chemically bound to these types of rubber (styrene content of 25-30%) increases its compatibility with respect to polystyrene, with which they can be combined by different methods to achieve an impact resistant polystyrene. The molecular weight of the polybutadiene used in this case is usually between 180,000 and 260,000 g mol-1. It is also a polybutadiene made with cobalt ('high-cis') or lithium ('low-cis') catalysts. Sometimes an elastomer consisting of a styrene-butadiene diblock may be used. In this way smaller particles are generated than with the addition of polybutadiene, since this polymer forms particles of a smaller size.
HIPS Applications
HIPS pellets have a multitude of applications. It stands out its use in the form of plates and flat sheets. It is also used in housings of vacuum cleaners, televisions, cameras, machines, components of household appliances, toys, television and audiovisual equipment parts, tape tape recording, bicycle trailer, toys In the automotive industry, panels and instrument accessories , gasoline tanks, for office: computer cases. In the field of packaging is the most used, for example by the dairy industry for yogurt and all kinds of desserts. In recent times there is a growing demand for 3D printing