PU foaming agent for cement and concrete

Single Component Soft Polyurethane Foam

High pressure waterstops
Leakage Crack Waterstops1 Component Type Polyurethane

Product Information

This product is Hydrophilic (hydrophile property) waterstops that can be applied for the concrete underground structure where leakage occurs quite often, Inserted polyurethane resin reacts with water and forms Open Cell Foam rapidly. By reacting with water, this foam becomes high elastic such like rubber and also becomes high adhesive foam at time passes. Especially, it’s reactivity with water is outstanding therefore it is very effective to apply on a spot where there is liquidity caused by contraction, expansion, vibration or underground structure with lots of water. It will provide excellent waterstop effect even on the leaking spot by shattered crack.

Characteristics

Usage

Waterstop for fracture and leakage of all types of concrete structures and for the curtain grouting.

Application Area

Using Material

Construction Guideline

Preforation

Perforate around leaking and fracturing spot and fixate packer. Normally when injecting polyurethane foam, it is injected through packer generally. During the perforation use hammer drill and make holes with same diameter. External diameter of Drill Bit should be 10mm. Perforation angle between concrete surface and crack should keep 45 degree angle or under. If it is possible, then make position of perforation hole that contacts crack as thick as 1/2~2/3 of concrete thickness. If the concrete thickness is less than 10cm then directly perforate to fractured spot. If the thickness is 10cm~50cm, perforate in the distance of 1/5 thickness of the concrete. Conduct it around fractured spot with 20cm interval and perforate in zigzag.

Packer Installation

Select the suitable packer out of various kinds of packers that suits the most according to field circumstance. And use T-box wrench and firmly tighten up the packer to perforated hole and make sure not to bounce off by counter pressure. (It might get damaged if it is tightened too hard.)

Polyurethane Injection

Inject DHP-1000 Flexible Foam Type by using high-pressure injection equipment or grease gun. Maintain initial injection pressure about 40kg/cm² and keep injecting until waterstop material flows out through fractured spot. Halt injecting for a few minutes when DHP-1000 Flexible Foam Type flows out grossly between cracks during first PACKER injection, then injected foam will foam completely and it will become as seal material. For next injection operation, DHP-1000 Flexible Foam Type will fill up the cracks well enough. After 5 minutes, start to re-inject. You can ignore the chemicals that leaks out little bit, even you can check injection status. If the crack is very big then conduct sealing before injection. 

Removing Packer

Use vice pliers as a tool or bend off or use hammer to remove it.
If there is wet spot left then inject Polyurethane Foam again.

Finishing Opreation

Remove DHP-1000 Flexible Foam Type that is smeared around cracked area.
Spread with flexible sealing material (DH-CF30 Crack Cover Material)

Cleaning

All the equipments and tools that are used for this operation should be cleaned when the operation is finished. Detergent such as M.E.K, Acetone, Xylene, Toluene and urethane thinner should be used when cleaning. If the Foam is smeared on your skin during the performance, wash it immediately with flowing water. Used injection equipment should need to be stored after filling up the hose, pump and medical fluid container with Engine Oil and hydraulic oil.

Cautions

-  When you treating medical fluid, make sure you wear protective helmet, goggle clothes and other protective devices.
-  If the medical fluid is smeared on your skin, wash it off immediately and clean up with soapy water.
-  All the hand tools and equipments that are used for this operation should be cleaned with thinner thoroughly.
-  If you are working in sealed room, then make sure to conduct constraint ventilation for clean air.
-  If the medical fluid is smeared on your skin and causes skin trouble, then you should go see specialist for prescription.
-  If the temperature is below 5°C, then you must artificially raise up the temperature of medical fluid. This way you can  get proper Pot Life.
-  If the atmosphere temperature is high and the area is humid, Pot Life of medical fluid quickens. On the contrary, Pot  Life will slow down in low temperature area.
-  Be aware of it before you conduct the operation.

Storing Method

Recommended temperature for storage is 10~25°C with no moisture. Store it in cool area. Storing period is about 6 months in sealed condition however it can be corrupted according to storing area and conditions. Preferably use it as soon as possible. This product is packed with nitrogen gas. Once seal is removed, then use it as soon as possible.