Author: Site Editor Publish Time: 2024-11-11 Origin: Site
Polyurethane sealant is a sealant with polyurethane rubber and polyurethane prepolymer as the main components.
This kind of sealant has high tensile strength, excellent elasticity, wear resistance, oil resistance and cold resistance, but water resistance, especially alkali water resistance is poor.
It can be divided into heating vulcanization type, room temperature vulcanization type and hot melt type. The room temperature vulcanization type has one component and two components. It is widely used in buildings, squares, highways as caulking sealing materials, as well as automotive manufacturing, glass installation, electronic filling, submarine and rocket sealing.
Polyurethane sealant has the following advantages: excellent wear resistance; Low tenderness and softness; Wide range of adjustable performance; High mechanical strength; Polyurethane sealant, good adhesion; Good elasticity, excellent resilience, suitable for dynamic joints; Good weather resistance, service life up to 15~20 years; Good oil resistance; Resistance to biological aging; Moderate price
Polyurethane sealants also have some disadvantages. Cannot withstand heat for a long time; Light-colored formula is susceptible to UV aging; The storage stability of one-component glue is greatly affected by packaging and the outside world, and usually solidifies slowly; Bubbles and cracks may occur in high temperature environment. Many occasions require primer. At the same time, the water resistance of polyurethane sealant is also poor, especially the alkali resistance is not good.
