摘要:
A method of treating concrete pipe (10) is carried out by providing an aqueous lime slurry supply having a lime solids content above 35 % by weight of the slurry. This is mixed within an amount of dispersing agent and may contain an alkali metal hydroxide so that the slurry has a pumpable viscosity. A spray assembly (28) is located within the interior of the pipe. The lime slurry is pumped from this lime slurry supply through the spray assembly (28) so that the lime slurry is applied to the interior surface of the pipe to neutralize acids thereon. Applying the lime spray also provides a protective coating of the lime slurry on the interior surfaces of the pipe.
摘要:
Water-redispersible powdered compositions including a powder of at least one water-insoluble film-forming polymer prepared from at least one ethylenically unsaturated monomer, at least one non-ionic surfactant selected from polyoxyalkylene derivatives, and at least one water-soluble compound selected from polyelectrolytes belonging to the weak polyacid family, are disclosed.
摘要:
The invention relates to water-soluble copolymers and terpolymers used as stabilizers for aqueous building material systems and water-based painting and coating systems. The advantage of these copolymers and terpolymers, as used according to the invention, compared to conventional products is due, on the one hand, to the very good stabilizing properties of the correspondingly produced building material systems or water-based painting and coating systems and, on the other hand, to the fact that the viscosity of the systems is hardly increased so that they have an excellent processability.
摘要:
A refractory composition is disclosed comprising a high purity silicon dioxide and a binder. This refractory composition may be applied by trowelling, brushing, casting, pumping and/or spraying it on a worn and/or damaged high purity silica refractory surface. A refractory castable composition is also disclosed that may be employed with forms. Further, an essentially non-slumping, sprayable refractory castable composition that is applied without the use of forms is provided. The sprayable refractory castable composition comprises (a) a tempered, pumpable first component comprising (i) a high purity silicon dioxide and a binder, and (ii) water, if needed, to achieve a pumpable consistency, and (b) a second component comprising a flocculating agent. The flocculating agent is added to the first component for achieving installation of the sprayable refractory composition in an amount to prevent slumping of the sprayable refractory castable composition.
摘要:
Water-redispersible powdered compositions including a powder of at least one water-insoluble film-forming polymer prepared from at least one ethylenically unsaturated monomer, at least one non-ionic surfactant selected from polyoxyalkylene derivatives, and at least one water-soluble compound selected from polyelectrolytes belonging to the weak polyacid family, are disclosed.
摘要:
The invention relates to water-soluble copolymers and terpolymers used as stabilizers for aqueous building material systems and water-based painting and coating systems. The advantage of these copolymers and terpolymers, as used according to the invention, compared to conventional products is due, on the one hand, to the very good stabilizing properties of the correspondingly produced building material systems or water-based painting and coating systems and, on the other hand, to the fact that the viscosity of the systems is hardly increased so that they have an excellent processability.
摘要:
A method of treating concrete pipe is carried out by providing an aqueous lime slurry supply having a lime solids content above 35% by weight of the slurry. This is mixed within an amount of dispersing agent and may contain an alkali metal hydroxide so that the slurry has a pumpable viscosity. A spray assembly is located within the interior of the pipe. The lime slurry is pumped from this lime slurry supply through the spray assembly so that the lime slurry is applied to the interior surfaces of the pipe to neutralize acids thereon. Applying the lime spray also provides a protective coating of the lime slurry on the interior surfaces of the pipe.