Polystyrene (ps) is a colorless and transparent thermoplastic. The general formula is [(ch2chc6h5)n]. Its glass transition temperature is higher than 100 degrees Celsius, so it is often used to make various disposable containers that need to withstand the temperature of boiling water, namely disposable foam lunch boxes.

Because of its brittleness, low softening temperature and easy cracking, polystyrene has seriously affected its use. In order to eliminate its shortcomings, modified polystyrene appeared; The way is that styrene monomer is polymerized with other units, or polystyrene is mixed with other polymers and polymers. Its improved varieties mainly include the following:

1. Tough polystyrene

In order to improve the brittleness of polystyrene, it was mixed with rubber (styrene-butadiene or nitrile-butadiene) and other elastomers to make toughness modified polystyrene, which improved the impact strength of polystyrene, but reduced the transparency and electrical properties of the product.

2. Chlorinated styrene

Two chlorine atoms are introduced into the structure of styrene to make dichloroethylene monomer, and then polymerized into dichloroethylene synthetic resin. This modified polystyrene is still a transparent object, and its heat resistance and impact strength are greatly improved.

Impact polystyrene is an impact polystyrene product produced by adding polybutadiene rubber particles into polystyrene. This polystyrene product will add micron-sized rubber particles, and the polystyrene and rubber particles will be connected together by grafting.

When impacted, the tip stress of crack propagation will be released by relatively soft rubber particles. Therefore, the crack propagation is hindered and the impact resistance is improved.

Or in design, a plurality of reinforcing heat insulation ribs are arranged on the outer side of the cup wall, cup edge reinforcing ribs and connecting ribs are respectively arranged on the lower side of the cup edge near the cup mouth and the outer side of the cup wall, and an upper boss, a middle boss and a lower boss are respectively arranged on the inner side of the cup wall from top to bottom. Compared with the prior art, the disposable thermos cup of the utility model has the characteristics of simple structure, beautiful use and heat preservation without burning hands. The application of heat insulation ribs not only increases the strength of the cup, but also basically saves the trouble of using the cup holder.