Polyether polyol used for polyurethane single-component grouting materials and preparation method and application thereof

Abstract

The invention relates to polyether polyol used for polyurethane single-component grouting materials and a preparation method and application thereof. The method mainly overcomes the defects that the water covering amount of polyether for original polyether grouting is small, and the strength of solidified bodies formed through reaction between polyether and water is low. The method includes the following steps that initiating agents and solid catalysts are input and mixed and are heated and dewatered after being evenly stirred, EO / PO is introduced, and aging is performed after material introduction ends; cooling is performed, water and neutralizers of phosphoric acid are added, neutralizing and stirring are performed, aluminum silicate adsorbents are added, low boiling matter and water in crude ether are removed through temperature raising vacuumizing, and finished products are obtained through press filtration after water content is analyzed to be qualified by central control analysis.

Description

technical field

[0001] The invention relates to polyether polyol for polyurethane and its preparation method, which is used for preparing polyurethane grouting material, especially one-component polyurethane grouting material. Background technique

[0002] Polyurethane grouting material, referred to as cyanide, is a chemical slurry composed of a prepolymer prepared by the reaction of polyisocyanate and polyhydroxy compound, and some other additives such as catalyst, foam stabilizer, foaming agent, and retarder. Since the slurry contains unreacted end-NCO groups, when the slurry is injected into porous buildings or loose formations, once the -NCO groups contact with water, chemical reactions such as chain extension, branching, and cross-linking will occur. In the gaps of buildings or the pores of foundation soil particles, a water-insoluble gel-like consolidated body is formed, and the consolidated body contains a large number of polar groups, which have a strong affinity and...

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