POLYURETHANE SEALANT FOR CONSTRUCTION products is used to seal the joints between various building components or materials, which can be free from the influence of the environment, such as temperature, rain, water vapor, air flow, sand, dust, etc. Moreover, the sealant can deform with the shape of the sealing surface, is not easy to flow, and can adhere to the adjacent base materials, and has the ability to compensate the joint displacement without falling off from the base material or separating itself. This kind of POLYURETHANE SEALANT FOR CONSTRUCTION is suitable for sealing, joint filling and installation of buildings, squares, highways, sidewalks and other buildings.

POLYURETHANE SEALANT FOR CONSTRUCTION products are generally divided into single component and two-component types: 1. Two component sealant takes isocyanate terminated prepolymer and additives as one component, polyol curing agent or polyol mixed with a small amount of diamine and other additives as the other component. 2. One component polyurethane sealant is a mixture of prepolymer and various fillers, which is sold in the form of cylindrical single package. The sealant can not be self vulcanized in the container and has good stability, which brings some difficulty to the preparation of single component sealant.

Usage of POLYURETHANE SEALANT FOR CONSTRUCTION products: 1. Treatment of the construction surface: first dry the construction surface with a brush or cloth, and then wipe it with a wet cloth soaked in solution. 2. Strip filling material: when squeezing the sealant into the gap, it should only stick to both sides of the joint. If the sealant adheres both sides to the bottom surface, the sealant and the bottom surface cannot move freely, which will cause the adhesion between the sealant and both sides or the sealant itself to be damaged. Therefore, when the sealant is used, a circular polyethylene foam strip with a width of 1-2mm is embedded at the bottom of the slot. 3. Paper tape: in order not to pollute the left and right surfaces of the joint when painting the primer and extruding the sealant, the paper tape must be pasted and torn off after the construction is completed. 4. Primer: apply primer to the adhered surface with a brush to increase the adhesion between sealant and building materials. 5. Filling sealant: align the front end of the sealant cylinder with the joint, cut off the cylinder head with a knife according to the size of the joint, and squeeze the sealant with an extrusion gun to completely fill the joints and corners. Pay attention not to mix bubbles, and use it as soon as possible once it is opened. 6. Finishing: after filling, press the sealant into the seam with a pressure spoon and scraper. If the construction tool is wet with soap water, the construction surface will be more beautiful. Remove the paper tape after completion.