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A solvent free type primer for concrete

IP.com Disclosure Number: IPCOM000250182D
Publication Date: 2017-Jun-08
Document File: 4 page(s) / 127K

Publishing Venue

The IP.com Prior Art Database

Abstract

Wacker used solvent free type or emulsion type of primers to treat concrete surface before applying sealant between concrete joints or other functional coating layers. Results show those primers can seal the porous material to create a hydrophobic surface; meantime no negative impact on adhesion between interfaces. Furthermore a long-term bonding even after 7 days in water can achieve.

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A solvent free type primer for concrete

Dinghao Zhong, Jack Peng

Abstract

Wacker used solvent free type or emulsion type of primers to treat concrete surface before applying

sealant between concrete joints or other functional coating layers. Results show those primers can seal

the porous material to create a hydrophobic surface; meantime no negative impact on adhesion between

interfaces. Furthermore a long-term bonding even after 7 days in water can achieve.

Keyword: solvent-free; emulsion; primer; siloxane resin; silane terminated polymer (SMP)

Background

Concrete is a kind of porous materials, where water, salts and bases can easily migrate through those

small holes. It is very difficult to coat, bond or seal concrete directly without any pretreatment or primer,

especially with some fresh concrete with higher moisture content, some concrete with loose surface, or

concrete serve with rain, water or in any other hash climates.

Normally people will use some primer to treat concrete surface in advance. Those primers are mostly

based on epoxy, acrylic or silanes solution with large amount of solvent to lower down these systems’

viscosity; then they can easily penetrate the concrete surface to guarantee a longer service time with good

sealing property. However those solutions contain large amount of solvent, which are normally toluene,

BA, acetone and so on. Those solvent have a common property of low flash point, which mean they are

flammable materials. It is well known that restriction to flammable materials, including transportation, stock

even application area gets more and more tight. Therefore, Wacker invite a series of solvent free primers,

which contains at least one of the following materials: silane terminated polymer, silanes, and siloxane

resins. It may be emulsion; it may be 100% solid content with a lower viscosity in the range of 10 to 1000

cps. Application testing shows positive results on concrete surface.

Experiments

New primers were prepared by at least one of the following materials but not restricted to silanes, SMP

resins, and siloxane resins; for example: SILRES® BS 1001 or SILRES® BS 6920 combined with

GENIOSIL® GF9…

Performance testing conducted as below procedures:

Step1: Clean the concrete...