Polymer expanding material used in permeation or seepage waterish environment and preparation process of polymer expanding material

Abstract

The invention relates to a polymer expanding material used in a permeation or seepage waterish environment and a preparation process of the polymer expanding material and belongs to the technical field of polymer expanding foam materials. The material is prepared from raw materials in parts by weight as follows: 20-30 parts of rosin polyester polyol, 20-50 parts of isocyanate, 20-40 parts of PhireGuard MB-512, 5-10 parts of 1,1-dichloro-1-fluoroethane, 1-2 parts of a surfactant, 0.01-1 part of a catalyst and 0.01 parts of benzoyl chloride. The material has high sand stabilization strength, high curing speed, good elastoplasticity, good pouring property, permeability and expansibility, is applicable to the permeation or seepage waterish environment, particularly to construction of water conservancy projects and following operation processes and is used for solving problems of dam permeation, piping and the like.

Description

technical field [0001] The invention relates to a polymer expansion material in a seepage or seepage multi-water environment and a preparation process thereof, belonging to the technical field of polymer expansion foam materials. Background technique [0002] In the construction and subsequent operation of water conservancy projects, the seepage and piping problems of dams are the most common problems. Piping refers to the phenomenon that fine particles in non-cohesive soil move or are carried out by water flow through the pores of coarse particles under the action of seepage, which is one of the forms of seepage erosion damage. Piping first starts at the locality where the properties of the soil change abruptly, such as where fine grains, grains with light bulk density and cracks are distributed. The particles in the soil move first to form a void, which gradually expands and moves downward to form an irregular tubular channel. It can occur at the place where seepage esca...

AI Technical Summary

Problems solved by technology

This has caused the general polymer expansion two-component material to react in the air or in an environment without a large amount of water to obtain a product with higher performance, but in an environment with a large amount of water, the reaction rate of the foaming reaction is much higher than that of the foaming reaction. Far greater than the gel reaction, resulting in a large amount of carbon dioxide foaming agent in the material system, resulting in excessive foaming, excessive expansion ratio and loss of density and strength. This is the construction failure of polymer expansion materials in water conservancy projects and other water environments The main reason

Moreover, when the polymer expansion material is injected into the seepage or seepage watery environment through high-pressure grouting equipment, due to the fast flow rate of the material, it will collide with the water at the grouting outlet, resulting in a mixing effect between the material and water. The effect makes more isocyanate functional groups in the material react with water under the action of the catalyst, releasing more carbon dioxide foaming agent, making the material volume expand excessively to form a foam with low density and compressive strength, which cannot meet the requirements of impermeability ( Test standard GB50404) indicators

Images