Which is better, pre-laid waterproofing membrane or butyl tape

Pre-laid waterproofing membrane is an important waterproof material in underground engineering. In the market, there are many varieties and specifications of pre-laid waterproofing membranes. How about butyl tape? Let's see: The butyl tape manufacturer introduced that this waterproof membrane is made of plastic (HDPE, LDPE, EVA, etc.) or rubber (EPDM) as the base material, thermally compounded butyl rubber, self-adhesive, and compound separation layer. The polymer self-adhesive film with plastic as the base material is grade gb23457-2017P, and the polymer self-adhesive film with rubber as the base material is grade gb23457-2017r.

In the production of hot melt adhesives and modified asphalt self-adhesives, processing oils need to be added. This medium and small molecular weight oil will volatilize and migrate. Once the oil flow resistance disappears, the oil flow resistance will not be greatly reduced. Leakage accidents occur after a building has been in use for a period of time. According to empirical statistics, the storage time of modified asphalt self-adhesive materials under indoor storage conditions is 2-3 years, that of inferior materials is 3-5 months, and that of hot melt adhesive is 5 years. In addition, the standard thickness of hot melt adhesive is 0.25 mm. There are problems with water channeling resistance and sealing, and there is a high possibility of waterproof damage.

Butyl tape is made by mixing butyl rubber, liquid rubber, tackifying resin and filler.

The thickness, aging resistance, chemical resistance and bonding stability of the self-adhesive tape are the key factors that affect the waterproofing effect of the pre-laid waterproofing membrane. The key indicators reflecting the performance of self-adhesive materials are heat resistance, low temperature resistance, permeability and water channeling resistance. The heat resistance and low temperature resistance of butyl self-adhesive are 100 °C and -35 °C respectively, which are better than 80 °C and -25 °C of hot melt adhesive, and 70 °C and -20 °C of asphalt self-adhesive. The permeability of butyl self-adhesive is better than that of hot melt and bituminous self-adhesive. The main reason is that there is no processing oil in the production process of the butyl tape, but the viscosity of the liquid rubber is stable, and the viscosity will not be lost after more than 100 years in the hidden state of the underground project, ensuring the water channeling resistance of the waterproof layer, and there will be no leakage accidents. throughout the life cycle.