Pre-foaming high-expansion polyurethane caulking compound and preparation method thereof

Abstract

The invention discloses a pre-foaming high-expansion polyurethane caulking compound which is mainly composed of the following raw materials by weight: 18 to 35 parts of polyether polyol, 2 to 15 parts of polyester polyol, 30 to 45 parts of polymethylisocyanate, 8 to 10 parts of dimethyl dimethanamide and 10 to 15 parts of a solvent. Polyether polyol, polyester polyol, polymethylisocyanate, dimethyl dimethanamide and the solvent are mixed together and stirred at room temperature, then an obtained mixture is filled into a pressure vessel, and finally an additive is filled into the pressure vessel. The caulking compound provided by the invention is a pre-foaming product, foaming of the caulking compound reaches 80 to 90% in seconds after the caulking compound is extruded, the extent of later foaming is small, so a worker can well control hand power when using a foaming gun, easiness and convenience are realized, glue is not wasted, cost is substantially saved, and deformation of a product is avoided. The caulking compound has high expansion performance and has a foaming volume reaching 70 to 80 times, one time greater that of a traditional caulking compound, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a caulking agent, in particular to a pre-foaming high-expansion polyurethane caulking agent and a preparation method thereof. Background technique [0002] With the rapid development of the country's construction industry, high-rise buildings have sprung up one after another. People have higher and higher requirements for the quality and safety of construction projects. The installation and application of aluminum alloy doors and windows, plastic steel doors and windows, and plumbing and sanitary ware are becoming more and more extensive. If traditional cement mortar is used for filling, water leakage and deformation of door and window frames are common when the project is completed and delivered. Aluminum alloy and plastic steel doors and windows must be filled, connected or elastically connected with lightweight materials during installation. [0003] The foaming ma...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a pre-foaming high-expansion polyurethane sealant and its preparation method to overcome the problem in the prior art that the product foams about 50% instantly after being ejected, and the subsequent foaming causes Problems of window deformation, material overflow causing waste and low expansion ratio