Construction joint sealant a high modulus (low modulus) polyurethane water stop adhesive a two-component sealant professional production
Product Name: Road joint sealant, scientific name is joint sealant, and industry standard is road hot melt joint sealant. It is also called pavement joint sealant, road sealant, asphalt pavement joint sealant, and asphalt joint sealant. Sometimes mistyping can also be used to write asphalt pavement joint sealant, road joint sealant, pavement joint sealant, asphalt joint sealant, etc. Main ingredients: This product is based on the heavy cross modified asphalt, adding a certain kind and proportion of other materials, and then through special process.
Application scope: application 1: Road joint sealant is suitable for crack filling and repairing in asphalt (or cement) concrete pavement, house roof, house water seepage, ground and other projects, and can also be used for sealing and waterproofing of expansion joints in pavement, water seepage, roof and ground, with the main purpose of waterproof sealing. Application 2: for asphalt concrete pavement with asphalt loss, it can also supplement the asphalt content on the surface by melting the road, pouring the joint glue and spreading or using the 1mm pavement to stick the joint belt to cover the surface, so as to prevent the aggregate falling off and other phenomena caused by the natural loss of asphalt on the pavement.
Product features: with the characteristics of rapid hot melting, easy construction, long-lasting sealing, good low-temperature flexibility and high-temperature stability, the road joint grouting adhesive can achieve - 40 ℃ non cracking, 80 ℃ non sticking, completely coping with the seasonal change of the thermal expansion and cold shrinkage effect of road cracks.
Construction process of road joint pouring glue: 1. Slotting: use a special slotting machine to carry out this operation. According to the crack mark, adjust the slotting width and depth of the slotting machine according to the width and depth of the crack, and cut out the uniform U-shaped groove at least 3mm on both sides of the crack according to the center line of the crack, exposing the new bonding surface 2. Joint pouring : heat the road joint filling adhesive to the filling temperature, and use the pressure nozzle on the joint filling machine to evenly fill the material into the groove. In order to ensure that the material temperature does not decrease, the discharge pipe shall have the heating function. The needle nozzle can be used to fill the seam, or the filling work of each crack in the sealing layer that is dragged into the width of scraper on both sides of the crack should be continuous. If there is a crack that has not been filled and sealed, it needs to be filled again. 3. Open traffic can be opened after cooling for 1 or 2 hours according to the temperature conditions.
Brief introduction of two-component polyurethane sealant: Polyurethane building sealant is a two-component reaction curing type, consisting of a and B components. A component is milky white or light yellow viscous polyurethane prepolymer, B component is curing agent and The black paste or liquid, which is dehydrated and mixed with additives, has certain elasticity and cohesiveness after curing. It has the following characteristics: excellent wear resistance, low softness and softness, wide adjustable range of performance, large mechanical strength, good cohesiveness, good elasticity, excellent resilience, good weather resistance, good oil resistance, and biological aging resistance Low price. Polyurethane sealant also has some disadvantages. For example, it can't be heat-resistant for a long time; light color formula is easy to be aged by ultraviolet light; the storage stability of single component adhesive is greatly affected by packaging and the outside world, and it usually solidifies slowly; bubbles and cracks may occur under high temperature and hot environment; primer is required in many occasions. At the same time, polyurethane sealant has poor water resistance, especially alkali water resistance.
Application scope of sealant: the product is used for the connection of building materials such as civil construction industry, transportation industry, concrete prefabricated parts and the filling and sealing of construction joints. High grade roads, bridges, airstrips, underground pipelines, joint sealing and expansion joints and deformation joints of tunnels and buildings.