Butyl tape, as a vigorous waterproof repair in recent years, has been greatly expanded in its application field. From the initial cap treatment, it extends to seam treatment, structural bonding treatment and so on. In the market, the price of butyl rubber belt products is fluctuating, and the quality of products is uneven. Many repair builders only know that this material is good. Why is it good? How to achieve the best effect by supporting construction? This is the problem that this popular science wants to explain. 1. What is butyl tape and what kinds are there? Butyl rubber tape is made of butyl rubber and polyisobutylene as the main components, with reinforcement layer, facing material or isolation layer. Butyl rubber and polyisobutylene are the core layers. The reinforcing layer is generally a variety of tire bases, and its function is to control ductility. The isolation layer is generally a PE film, which needs to be removed during use. There are various decorative layers, including aluminum foil decorative layer, polymer film decorative layer and fluorocarbon film decorative layer. According to the size, butyl adhesive tape can be divided into single rolls, with widths of 50 mm, 75 mm, 100 mm and 150 mm. It can also be made into large coils with a width of 1 m and 2 m. The production process of large coil and single coil is different. The butyl rubber coating integrity of large coil is slightly worse than that of single coil. For a large coil, it is not a big problem that there is a small area of glue layer in the middle, but if it is a single coil, it will affect the whole completion effect. It is not recommended to cut large coils into small coils. According to the situation of facing layer/isolation layer, butyl adhesive tape can be divided into single side and double side. Single-sided butyl rubber tape refers to butyl rubber material with decorative layer and isolation layer on both sides; Double-sided butyl rubber tape refers to butyl rubber material with isolation layers on both sides.

2. What is the bonding mechanism of butyl adhesive tape and where is it generally used? The bonding mechanism of butyl adhesive tape is a kind of high molecular bonding, similar to VAE rubber powder in dry-mixed mortar. It is different from cement key-lock connection. Butyl tape can't penetrate into the bonded layer. The effective thickness of butyl adhesive tape is very thin. If the smoothness or strength of the base is poor, the bonding effect will be affected. Because of poor flatness, the effective bonding area will be reduced. If the strength of the base is poor, it is easy to be skinned by butyl tape. Butyl tape is generally used in joints, which is a soft connection. Often used at the junction of two materials. For example: the periphery of the window frame; Concrete-steel joint; Various joints of steel structure roof; Concrete must be broken for various needs, etc.

How to judge the quality of butyl tape simply? The quality of butyl adhesive tape is not only the conventional technical indicators. Thermal adhesion effect is an important index. In summer, the surface temperature of steel structure roof is very high, and it is a big problem whether butyl adhesive tape can stick firmly for a long time. Good butyl adhesive tape, the retention rate of high temperature adhesion effect is above 95%.