MINERAL-BASED WATERPROOFING SEALANTS2k cementitious waterproofing /hydraulic setting systems

Synthomer dispersions elevate your two-component (2k) waterproofing Cementitious waterproofing systems to protect mineral-based substrates inside and outsideCrucial in several contexts, e.g. building surface protection, water reservoirs, and swimming poolsSynthomer dispersions build a barrier against water on a membrane levelOur range contains various essential dispersions for your 2k cementitious waterproofing systems

Watertight barriers with polymer enhanced membranes Surface protection is needed to avoid water penetration into moisture sensitive substrates. It is also used to protect surfaces against migration of chemicals like de-icing salt in concrete or to secure critical substrates from attack by chlorine, acidic rain, carbon dioxide, etc.

TTo get a functional membrane (or protective coating) it is necessary to use a polymer which builds a polymer matrix in the membrane to form a very dense layer against liquids after curing. The elastomeric waterproofing coating maintains its flexibility under permanent immersion in water and when exposed to a wide variety of weather conditions. These systems can withstand extreme weather conditions andand climate changes (hot / cold, freezing, dry / wet). The coating is resistant to constant water contact and is used in cisterns as well as water tower storage tanks.

Such hydraulic setting surface protection systems can be split into three different categories:

Category 1: hard, for surfaces without any movements

Category 2: semi flexible with good flexibility and crack bridging performance

Category 3: highly flexible even at temperatures below 0°C, excellent low temperature elasticity and very good crack bridging performance

SSynthomer offers a broad range of specially developed XSBR-lattices (LIPATON SB) or acrylic dispersions (REVACRYL and PLEXTOL-brand) for all of this different applications.

Applications Typical applications for polymer modified cementitious waterproofing membranes are:

• surface protection of buildings• surface protection for reinforced and pre-stressed concrete •• lining of water reservoirs• waterproofing of balconies under tiles• waterproofing of cellars• underlayment for tiles in swimming pools• bathrooms • cisterns and water towers• showers and wet rooms

WWaterproofing for balconies and terraces, cellars and surface protectionThisThis application poses the highest demands on waterproofing. It must be able to resist the weather, be waterproof and provide some structural stability. Also, movements of the exterior construction parts are usually sufficiently large that it is necessary to use waterproofing systems with high crack bridging capabilities.

Application example:Underfloor cistern as subject for waterproofing

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Waterproofing for tanks and pipesLeakingLeaking sewage pipes in wastewater treatment plants lead to considerable damage to the environment (e. g. soil, ground water) which is often discovered very late. When restoring such deterioration it is important to repair the different types of damage with waterproofing systems which are specifically adapted to the need. The failure analysis reveals if locally limited waterproofing of the leakageleakage is sufficient or if the entire surface of the tank or pipe has to be protected from chemical attack.

Waterproofing in cistern and drinking water towers / reservoirsIn areas for drinking water storage a drinking water approved system is mandatory. Some of our polymers are suitable for this type of application. These polymers need to have low odour, and no impact on the taste of the stored water. Furthermore the polymers need to fulfill the regulations of each individual country for contact with drinking water.

PProperties of polymer modified cementitious membranesThe use of Synthomer dispersions improves membrane properties like:

• water impermeability• water vapour permeability• reduction of gas permeability and protection of concrete (reinforcing steel) against carbonisation

• crack bridging• resistance against migration of chloride• low temperature flexibility• high wet strength• freeze thaw cycle and de-icing salt resistance• durability under consistent water contact

SomeSome Synthomer grades comply with drinking water regulations. Additional information on this topic can be requested from our Regulatory Affairs Department.

CompositionFlexibleFlexible cementitious coatings consist of two pre-mixed components. The powder component contains mainly quartz sand, cement, and various additives such as, thickener, hydrophobic agents etc. The liquid component consists mainly of a specially designed polymer dispersion with excellent cement compatibility. The liquid can also be modified with defoamer and other additives for optimum application papplication properties.

Typical ratio by weight of polymer dispersion and cement is 1:1 to 1.5 to 1. Higher amounts of the polymer improve properties like elongation, adhesion and waterproofing of the membrane. Increasing the amount of cement in the dry mixture results in a harder and less flexible membrane. Fine particle size fillers (e. g. calcium carbonate) give better tensile strength and elongation than coarse fillers like sand.

Meet the Synthomer binders for your 2k membranePreparation of the substrateAsAs with all coating systems, surface preparation is of prime importance. Remove all grease, oil, dust, residual curing compound, mould release agent or other contaminant that could impair adhesion. Laitance should preferably be removed by light sweep blasting or hydrojetting. Mechanical wire brushing may be appropriate for small areas.

TheThe surface must be solid, supportive, gypsum-free, absorbent and mostly level. Areas soiled with oil, grease or other separating layers have to be cleaned. Edges and lumps have to be broken; grooves have to be filled using a mortar. Lime plaster has to be removed. When salt efflorescence becomes visible the surface has to be treated with an approved salt binder. Before applying the flex sealingsealing slurry 2k, the substrate has to be pre-wetted thoroughly in order to achieve a slightly (not shiny) humid surface. Excess water has to be removed. For indoor sealing a primer has to be used before application of the slurry.

Mixing and applicationThe ready mix powder component should be mixed with the liquid using a slow speed mixer fitted with a suitable paddle.The homogenous mixture is normally applied to the substrate with a brush, roller or trowel in a minimum of 2 coats to reach a total thickness of minimum 2 mm. The first coat should be allowed to become touch dry before application of the second one. The consumption is approx. 3 3 kg/m² to achieve a dry layer of 2 mm. The colour of the mortar modified with Synthomer polymer dispersions may vary from brownish to grey. This will not affect the performance of the final membrane.

Synthomer polymers for 2k hydraulic setting systems (flexible concrete application)TheThe right polymer is key to develop qualified waterproofing materials. Therefore the Synthomer range contains different binders, which have been designed to offer specific advantages for producers of 2k membranes, including high tensile strength, good water and alkali resistance, as well as excellent crack bridging performance and elongation properties. These binders show excellent cement comcompatibility and offer a wide formulation latitude to the membrane producer.

Plextol D 324Good flexibility at low temperature, ammonia-, plasticizer- and solvent-free

Plextol D 5241Extraordinary flexibility at freezing temperatures, outstanding crack-bridging, plasticizer- and solvent-free

Revacryl R 387 Styrene acrylic with good flexibility and water resistance

Revacryl AE 2091Ammonia-fAmmonia-free styrene acrylic, good water resistance for general flexible cement systems. Designed for performance in high temperatures regions.

Lipaton SB 33Y50XSBR with good cement stability and water resistance for semi flexible properties

Quick start your 2k membrane

Product Solid Content [%] 1 pH value 2 Viscosity [mPa*s] Tg [°C] MFFT [°C] Mean Particle Size [μm]

Plextol D 324

Plextol D 5241

Revacryl R 387

Revacryl AE 2091

Lipaton SB 33Y50Notes: 1According to ISO 3251 2According to ISO 976 3According to ISO 2555 (Brookfield) 4According to ISO 1652 (Brookfield LVF, 60 rpm) *Data describe typical properties - not product specifications

56.0

58.0

57.0

57.0

51.5

7.5

8.0

7.0

8.0

9.5

5003

5003

1503

1503

1104

-30

-48

-2

-11

-12

0

0

0

0

0

0.55

0.4

0.25

0.4

0.2

Emulsion properties*

1

2

3

4

5

6

More elaborated formula

Ingredients

Portland cement CEM I 42.5R

Plastorit Micro (Mica)

Melment F10

Polymer

Antifoam BYK 037

Water

Supplier

Dyckerhoff

Imerys Talc

BASF Performance Products

Synthomer

Byk

345.0

150.0

5.0

500.0

480

4.0

16.016.0

500.00

pbw

1

2

3

Basic starting formulation for screening the properties of the polymer

Ingredients

Quartz sand H 31

Portland cement CEM I 32.5R

Polymer

Supplier

Quarzwerke Frechen

Dyckerhoff

Synthomer

70.0

30.0

40.0

pbw

Putting our polymers through their paces

Product name

Revacryl R 387

Revacryl AE 2091

Lipaton SB 33Y50Notes: 1According to DIN EN 14891 2According to DIN EN 14891 3According to internal test method 4According to DIN EN 14891 *Data describe typical properties - not product specifications

Elongation 1 [%]

66.0

62.0

50.0

Tensile strength 2 [N/mm²]

0.29

0.27

0.38

Water uptake 3 [%]

12

12

10

Adhesion 4 [N/mm²]

0.8

0.7

> 1

Test results based on starting formula #1 *

America, Europe and South East Asia. In March 2017, we acquired the coalescing agents and Butyl Ethyl Propanediol (BEPD) business from Perstorp Oxo Belgium AB. The newly acquired businesses significantly improve our footprint to a number of speciality markets which we will continue to serve through a strong network of local technical service and sales branches, supported by regional application dedevelopment and production in our key markets. We deliver the right formula, globally, individually.

Synthomer is one of the world’s leading suppliers of emulsion and speciality polymers supporting leadership positions in many market segments including coatings, construction, technical textiles, adhesives, paper and synthetic latex gloves. The company has its Head Office in London (UK) and provides customer focused services from operational centres in Harlow (UK), Marl (Germany), Kuala LumpurLumpur (Malaysia), Shanghai (China) and Dubai (UAE). In June 2016 we have acquired the Monomers, Dispersions and Powders business (MDP) from Hexion with dedicated production sales and customer service facilities in North

Disclaimer: This information and any other advice or recommendations given or made by us (collectively “Information”), are provided in good faith and are not intended to, nor do they, constitute professional advice or services. Information is provided “AS IS” and on an “AS AVAILABLE” basis and without warranty. We do not warrant or accept responsibility for the accuracy, timeliness or completeness of the Information, or for the suitability of the Information for a particular purpose. We do not accept responsibility, and exclude all liability (including(including under any implied warranties), for any matters arising out of or in connection with your reliance on the Information (including as to infringement of third party intellectual property rights) to the fullest extent permitted by law. Any Information concerning any possible use or application of Synthomer products is given by us in good faith; we do not warrant the fitness of any Synthomer products for any particular purpose and it is entirely for you to satisfy yourself fully as to the suitability of Synthomer products for any particular purpose. purpose. Synthomer products are sold in accordance with Synthomer’s standard terms and conditions of sale which are available from www.synthomer.com/tc.

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