Selection of sealing strips for building doors and windows

①PVC resin cylinder single blend modified material.Rubber strips made by modifying PVC resin with polymer modifiers (generally using crosslinked nitrile rubber or rubber-type chlorinated polyethylene) are generally called blended polyvinyl chloride elastomer sealing strips or modified polyvinyl chloride sealing strips.Due to the addition of polymer modifiers, the resilience of the sealing strip and the high and low temperature tolerance of this material have been improved, and the strength is high and the aging resistance is good. The basic physical properties can reach GB/T12002 or JG/T187 standards, and the price is moderate. It is currently used in the manufacture of door and window sealing strips for construction. It is more common.

Some companies use waste materials of different quality and complex composition to produce sealing strips, and when blending, no modifier is added and the filler is added in excess, which becomes a high-filling PVC sealing strip. This rubber strip has poor strength, low elasticity, and easy to break.Some manufacturers also add aromatic oils or heavy oil from refining residues that replace plasticizers to make sealing strip products not only have a pungent smell, but also deform and shrink in a short period of time, and even fall off, causing doors and windows to lose their sealing effect, so the use of such rubber strips is prohibited.

②EPDM/polypropylene crosslinked dynamic vulcanized thermoplastic elastomer material (TPV).This is a new material that has been formulated in foreign countries and has industry standards in China. It is used in building doors and windows at home and abroad.The performance of this TPV material is comparable to that of vulcanized EPDM rubber. Due to its good craftsmanship, small specific gravity, high window rate, and no heavy metals and halogens, it is a new energy-saving and environmentally friendly material with high practical value.Real estate above 4000 yuan/M2 began to be selected.

③High degree of polymerization resin crosslinked blended modified elastomer material (TPE).The feature is that there is no need for vulcanization process, and the use of thermoplastic molding method for processing can greatly shorten the molding cycle, and the waste can also be recycled and reused, which is conducive to resource saving and energy saving. It is a promising material for development and can be used as a substitute for vulcanized rubber.The modified polyvinyl chloride sealing strip has good compression and deformation resistance, and is considered by the National Construction Association to replace EPDM as a door and window sealing strip and weatherproof strip.Its performance is the same as TPV, but the formula of the raw materials used is different.The current sales price is slightly lower than TPV. For customers, it is a high-quality and cheap product, which can improve the quality of doors and windows without increasing the cost.It has high marketing value and has become the selected material for door and window manufacturing enterprises and export products.