Elastic grouting water-stop glue

Abstract

The invention relates to elastic grouting water-stop glue. The invention relates to a polyurethane hot melt adhesive which comprises the following components in percentage by weight: 40%-41% of polyether polyol, 7.3%-7.7% of polyphenyl polymethylene polyisocyanate, 26%-28.5% of plasticizer, 23.5%-24.5% of filler, 0.2%-0.4% of pigment and 0.2%-0.6% of antioxidant. The plasticizer is prepared by mixing four of dioctyl phthalate, diisooctyl terephthalate, dinonyl phthalate, butyl benzyl phthalate, di-sec-octyl phthalate, fatty acid methyl ester, acetyl tributyl citrate, tributyl citrate and chlorinated paraffin; the plasticizer is prepared by mixing four of dioctyl phthalate, diisooctyl terephthalate, dinonyl phthalate, butyl benzyl phthalate, di-sec-octyl phthalate, fatty acid methyl ester, acetyl tributyl citrate, tributyl citrate and chlorinated paraffin; the antioxidant is formed by mixing one or two of octadecanol propionate, bis (stearoyl) thiodipropionate, bis (cinnamoyl) thiodipropionate and polysiloxane; the antioxidant is formed by mixing one or two of octadecanol propionate, bis (stearoyl) thiodipropionate, bis (cinnamoyl) thiodipropionate and polysiloxane; the filler is formed by mixing one or two of calcium carbonate, diatomite, talcum powder and carbon fiber; the pigment is formed by mixing one or two of carbon black and graphite.

Description

technical field [0001] The invention relates to an elastic grouting waterproof glue. Background technique [0002] The existing problems of the main grouting plugging materials are as follows: [0003] 1. Poor durability and serious double leakage [0004] "Oil-based" foamed polyurethane grouting fluid expands and blocks cracks when it encounters water, but the high expansion of the material causes secondary damage to the structure. The foamy solidified structure is fluffy and inelastic, and crack expansion and contraction deformation will cause the plugging material to break. The water-stop function is lost, so that the structure damaged by high expansion will leak again, and the leakage is more serious than the original one; "water-based" foamed polyurethane has a faster reaction speed than oily, can block urgent water and has strong impermeability, However, when it swells with water, it becomes a gel-like conglomerate (also foaming). Its fatal weakness is that the gel-l...

AI Technical Summary

Problems solved by technology

[0003] 1. Poor durability and serious double leakage

[0004] "Oil-based" foamed polyurethane grouting fluid expands and blocks cracks when it encounters water, but the high expansion of the material causes secondary damage to the structure. The foamy solidified structure is fluffy and inelastic, and crack expansion and contraction deformation will cause the plugging material to break. The water-stop function is lost, so that the structure damaged by high expansion will leak again, and the leakage is more serious than the original one; "water-based" foamed polyurethane has a faster reaction speed than oily, can block urgent water and has strong impermeability, However, when it swells with water, it becomes a gel-like conglomerate (also foaming). Its fatal weakness is that the gel-like conglomerate is a gel with a high water content, and its shrinkage ratio due to water loss is very high, resulting in a very large volume change before and after encountering water. Large, basically loses the water blocking effect after drying, and the re-leakage rate is extremely high

[0005] When acrylate meets water, it forms a kind of gel, which is similar to "jelly" and has basically no cohesive force and strength. Because the interior is basically water, the water loss shrinkage ratio is also very high, and because there is not much cohesive force and strength, so it is easy to be squeezed out or crushed by external force, resulting in double leakage

Therefore, acrylate is not suitable for alternating dry and wet environments, and is not suitable for plugging permanent structural defects

[0006] 2. Not environmentally friendly

[0009] In summary, the main problems of the plugging materials in the prior art are: high dehydration shrinkage ratio, no strength, easy extrusion due to force due to weak cohesive force, poor durability, fragility caused by high expansion, and some contain organic solvents or the use of non-environmentally friendly raw materials