Лако-красочные материалы — производство

DAP is the most commonly used of the allylic esters, which are a branch of the polyester family. These thermoset products are typically selected for outstanding dimensional stability, ease of moulding and excellent electrical properties. DAP can be bonded with most engineering adhesives and good strengths [3] are achieved for many different adhesive technologies (Table […]

In this section, a guide is given to indicate the performance of several different adhesives for a selection of six thermoset plastics. The bulk of this information was taken from ‘The Loctite Design Guide for Bonding Plastics’ issued by Henkel Ltd [3] and for more detailed information the reader should refer to this guide. An […]

3.1 Introduction There are now so many thermoset plastics available that it can be difficult to differentiate between the various types. Thermoset resins are used for the manufacture of a wide range of parts from canoes to wind turbine blades and from polymer concrete to epoxy adhesives and so there is only a brief discussion […]

Structural adhesives for plastics are more often than not epoxies, two-part acrylics, cyanoacrylates or UV-cure adhesives. There are hundreds of different epoxy grades available and, whilst many of these are far more suited for bonding metals than thermoplastics, epoxies are used for some thermoplastic applications, especially if the gaps are relatively large or if the […]

The highly crystalline fluoropolymers include fluorinated ethylene polyethylene, perfluoroalkoxyethylene, polychlorotrifluoroethylene and ethylene-tetrafluoroethylene co-polymer but PTFE is perhaps the most widely used and certainly best known as ‘Teflon’ in non-stick cookware. The coefficient of friction of PTFE is lower than almost any other material and it has excellent temperature and mechanical properties although it does have […]

Polystyrene is a low-cost commodity plastic and is available in three main categories: • Crystal polystyrene, • High-impact polystyrene (HIPS), and • Expanded polystyrene (EPS). Crystal polystyrene is an amorphous polymer with superior clarity but generally lower impact strength than polycarbonate. HIPS is a toughened grade with reduced optical clarity. EPS is a low-density foam […]

Polypropylene is one of the lightest engineering thermoplastics (SG = 0.90) and it has excellent moisture resistance. One of the major disadvantages of polypropylene is its poor impact strength at low temperatures. It does, however, offer excellent fatigue resistance and it is widely used for luggage, packaging, toys and storage battery cases. Unfilled PP is […]

PPS is a crystalline polymer with a relatively high melt temperature (285 °C). It can sometimes be difficult to process but it does offer an excellent combination of long­term thermal stability and superior chemical resistance below 200 °C. Its inherent flame resistance and good mechanical properties make this material a popular choice for high-quality moulded […]

PPO is an engineering thermoplastic known for its excellent radiation resistance, oxidation resistance, thermal stability and electrical properties. Typical applications include television cabinets, car spoilers and laptop computer outer shells. PPO has one of the lowest water absorption rates of any of the engineering thermoplastics and has excellent flame retardance, electrical properties and impact strength. […]

POM is widely known as ‘acetal’ and a well-known trade name is ‘Delrin’, manufactured by DuPont. This is a popular engineering plastic to replace parts that might otherwise be manufactured from metals. It is generally easy to machine and therefore makes for a good engineering plastic for small batch production or prototype applications. Acetal is […]