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DSM
Decovery® by DSM is a family of plant-based resins designed to deliver high-performance products across the paint, ink and coating industries. Decovery® resins allow coating manufacturers to produce high quality products using safe ingredients with low VOC. Applications include coatings for walls, ceilings, flooring, joinery, wooden decks, furniture and inks.

Exterior Coatings Applications

Why use bio-based paints in exterior applications?

High volatile organic content (VOC) in exterior coatings was previously not considered a major formulation issue. The open exterior spaces can quickly disperse the volatiles limiting the health hazards associated with indoor use of these materials. The increasing focus on environment and sustainability, however, coupled with stringent regulations restricting VOC content in coatings is forcing manufacturers to rethink and reformulate their products. Alkyd resins, based on bio renewable material, have been used in coatings for decades. These resins are formulated into coatings using fossil based solvents which increase the VOCs in the product. Conventional water borne acrylic coatings avoid the use of fossil based solvents limiting their carbon foot print. The acrylic resin itself however is based on fossil based raw materials which makes it a non-sustainable solution.

DSM’s Decovery® resins partially replace the fossil-based content in coating resins with renewable plant based materials. Decovery® plant-based resins thus increase the sustainability of coatings and reduce their environmental footprint. To appreciate the environmental impact of bio-based resins, consider the example of a Decovery® plant-based resin designed for exterior and joinery coatings (SP-7450 XP). The resin contains 39% bio-based content, verifiable by the C14 method. This renewable content leads to a carbon footprint reduction of 29% when a conventional water-based resin in a joinery coating is substituted with the bio-based resin.


FootPrint


Every kilogram of traditional water-based resin, replaced in a joinery coating formulation with Decovery® resin, can prevent emission of approximately 0.73 Kg of CO2. The EU joinery coatings market has an annual consumption of approximately 70 Kilo Tons (KT) of resin. Complete replacement of conventional resins in the market with Decovery® plant-based resins can lead to a reduction of 51 KT of CO2 emissions. The reduction impact is equivalent to growing approximately 840,000 trees for 10 years!

Performance advantages of Decovery® bio-based coating resins in exterior coating applications

In addition to being highly sustainable, exterior coatings based on Decovery® plant-based resins deliver high performance that meets or exceeds the properties of alternative fossil based solutions. Decovery® plant-based coatings maintain their excellent aesthetics for longer. The bio-based resins are quick drying and non-yellowing when compared to alkyd based solutions. In general, Decovery® plant-based exterior coatings exhibit the following properties.

Extreme weather resistance
Decovery® plant-based exterior coatings show low water absorption and early water resistance properties which protect the substrates from moisture damage. The coatings also exhibit superior impact resistance and higher mechanical resistance which add to the overall weather resistance properties. Decovery® plant-based resins have a non-yellowing character which helps maintain the original color and appearance of the coating. The UV resistance keeps the coating from cracking, peeling or crumbling over time.

Durability
Decovery® plant-based exterior coatings show outstanding durability. Use of a long life Decovery® bio-resin allows manufacturers to offer extended warranties on the performance of their exterior coatings. Coatings based on Decovery® plant-based resins can qualify for KOMO quality mark certification and EN-927.

Process efficiency
Exterior coatings based on Decovery® plant-based resins require minimal curing time. The resin allows application of thicker coats with a single layer thickness of up to 50µm. This property can reduce the required number of coats to build up a given coating thickness. Decovery® based coatings show superior blocking resistance and excellent early water resistance which can simplify the application process.

Compatibility
Decovery® plant-based resins are compatible with standard solvents, pigments and additives. The compatibility reduces inventory costs and allows manufacturers to make a smoother transition to production of sustainable coatings.

Decovery® Bio-Based Resins for Exterior Coatings Applications

Decovery® SP-7450 has been designed for formulation of fast drying and fast blocking-resistance coatings for decks, fencing, joinery, facade and industrial applications. It is a copolymer emulsion containing 44% solids in demineralized water. The resin has a bio-renewable content of 39% on solids. It is suitable for formulation of both clear and pigmented exterior wood coatings.

Decovery® SP-7460 is ideal for formulation of exterior wall coatings that show outstanding durability, extreme weather resistance and processing efficiency. Its excellent durability allows formulation of exterior paints with 10-15 years warranty.

The table below summarizes the essential properties of two Decovery® resins for exterior applications.

SP-7450 XP
   SP-7460 XP
Bio-based content
39%
Applications 
Decks, Fencing Joinery, Facade  
Exterior Walls
Resistance to Extreme weather conditions 
Non-yellowing 
High Coating thickness 
Good impact resistance 
Low water uptake 
Fast curing 
Good blocking resistance 
Good early water resistance 
Compatible with standard solvents pigments and additives 
Good chemical resistance 
Excellent transparency 
 
High Durability (allows 10-15 years warranty) 
Good Adhesion to PVC 

Exterior Applications that benefit from Decovery®

Exterior Walls
Exterior wall coatings are exposed to cycles of UV radiation from the sun and moisture from rain and snow. These coatings must be formulated to withstand harsh weather conditions over an extended period of time. The binder resin in exterior coatings must be resistant to UV radiation, temperature fluctuations as well as exposure to moisture. The coating should not crack, peel or crumble under the stress of harsh weather. Decovery® SP-7460 XP based coatings deliver extra ordinary results when subjected to the most stringent QUV accelerated weathering tests. The coatings retain their integrity and mechanical properties when exposed to alternating cycles of UV light and moisture at extreme temperatures.

Exterior Deck


Decks and Fencing
Coatings for decks and fencing are meant to highlight and preserve the natural beauty and strength of wood. Poorly protected decks and fences can easily stain, crack, and splinter losing their aesthetics and structural integrity. Decovery® resins are well suited for use in the production of environment-friendly exterior wood coatings which protect the substrate and resist cracking and peeling under harsh weather conditions. A superior deck stain must not just seal the wood but also allow the natural wood veneer to show through. It must fortify the deck against moisture creating a durable surface that won’t peel or crack over time. Deck stains based on SP-7450 XP have excellent transparency as well as good water and chemical resistance. Coatings for decks and fencing, formulated using Decovery® plant-based resins show performance comparable or superior to that of coatings based on standard fossil-based binders. Table 1 compares the performance of bio-based wood coatings to fossil fuel based coatings. Clear coatings based on Decovery® show higher elongation at break and greater toughness than their fossil based counterparts. The early water resistance, blocking resistance and impact strength of bio-based coatings is comparable to that of fossil based products. Pigmented bio-based formulations also match the performance of comparable fossil based coatings.

Clear formulation Pigmented formulation
 
Fossil fuel based 
Plant based 
Fossil fuel based
Plant based
Bio-content of binder(on carbon)
0%
40% 
0%
40% 
Early water resistance(4hrs)*
2/5 
3/5 
 
 
Early blocking resistance(500 Om)*
3
Elongation at break(110 Om)
117 
122 
94
96 
Toughness(MPa)
12 
7.5 
7.5 
Impact(N) - RT/7°C
8/6 
7/6 
8/7 
9/7 
Outdoor exposure(24 months)
 
 
 Good
Good 
QUV EN 927-6(2016 hours)
 
 
 Good
Good 
Gardner wheel(357 cycles)
 
 
Good
Good 
(0= poor, 5= excellent)
Performance comparison of exterior wood coatings made from fossil fuel based monomers to coatings
formulated partially from plant based monomers. (Source: European Coatings Journal 04– 2018)

Exterior Facade


Exterior Joinery and Building Facade
Contemporary facades may include a range of different substrates such as wooden elements and aluminum cladding. Each substrate needs to be protected from weathering to maintain the aesthetically pleasing look of the facade over time. Exterior joinery elements need to be protected with primers, stained with color and finished with a glossy or matte topcoat. Building facades are also embellished with metal cladding to enhance the structure’s overall aesthetic appeal. Aluminum is generally the most favored material for cladding which gives a futuristic look to modern or renovated buildings and serves as a barrier against harsh conditions. Metal sheets and coils used to construct cladding need a durable protective coating. Whether you need to protect industrial wood or aluminum from external elements, DSM’s Decovery® resin SP-7450 XP can help you produce protective coatings that protect better and last longer. SP-7450 XP is suitable for formulation of waterborne coatings to protect industrial joinery, cladding, windows, doors, screen walls, solar shading, shutters and closures.

Request a sample

DSM can help you select the best plant-based Decovery® resin for your specific application. Take a look at sample formulations or contact DSM to receive expert advice.

Sample formulation 1
Wood stain based on Decovery® SP-7450
Pigmented facade coating based on Decovery® SP-7450

Raw Material
Weight %
1.
Decovery® SP-7450 XP
88.9
2.
Demineralized water
5.1
3.
Ester Alcohol
1.8
4.
Red Pigment Dispersion
0.4
5.
Yellow Pigment Dispersion
3.4
6.
Carbon Black
0.1
7.
Rheology modifier
0.3
Add 1 till 7 in listed order while stirring and mix with a small vortex. Continue mixing for a further 10 minutes or until a crater free film on glass is obtained.

Formulation Properties
Value
pH
7.5 
Viscosity Brookfield 6 rpm (25°C)
12,900 mPa.s
Viscosity Brookfield 60 rpm (25°C)
8,860 mPa.s
Dry solids by weight
41.0%
VOC (EU) incl. water
5 g/l
 
 
Application Properties
(with wire rod on oak veneer , 2 layers)
Gloss 20° / 60° / 85° (GU)
74/85/97
König Hardness (sec) after 24Hrs RT
37 Sec
König Hardness (sec) after 24Hrs at 50°C
63 Sec
Early block resistance: 4Hrs 50°C with 1 kg/m2 (5 = best / 0 = worst)
Early water resistance: (5 = best / 0 = worst)
15 min. / 30 min. / 60 min. / 120 min. / 180 min.
- Initial
- After Recovery
0/0/0/0/0
5/5/3/3/3
Elasticity
144% break
Toughness
10.7 Mpa
Adhesion aged alkyd: Rubs / Adhesion
- Sanded (Rubs / Gt)
- Not sanded (Rubs / Gt)
>2000 / 5
>2000 / 4
QUV resistance on wood: 20°/60°
- Initial
- After 1000 Hrs exposure
- After 2000 Hrs exposure
GU 37 / 82
GU 31 / 85
GU 20 / 74
Sample formulation 2
Pigmented Facade coating based on Decovery® SP-7450

Raw Material
Weight %
1.
Decovery® SP-7450 XP
36.11
2.
Demineralized water
13.37
3.
Ester Alcohol
1.71
4.
Red Pigment Dispersion
0.20
5.
Yellow Pigment Dispersion
0.10
6.
Carbon Black
0.39
7.
Defoamer
0.29
8.
Titanium dioxide
15.13
9.
Extender (Calcium Carbonate)
17.08
10.
Extender (Talc)
5.37
11.
Dipropylene Glycol n-Butyl Ether
2.34
12.
Propylene Glycol
1.56
13.
Rheology modifiers
2.4
14.
Demineralized water
3.95
Mix 2-10 in listed order and disperse until fineness of 10um is achieved.
Add 1 to mill base and add 11 to 15 in listed order while stirring and proceed with small vortex for another 10 minutes or until crater free film on glass is obtained.
Explore other applications using the Decovery® range of plant-based resins:

Formulation Properties
Value
pH
8.6
Viscosity Brookfield 6 rpm (25°C)
4,800 mPa.s
Viscosity Brookfield 60 rpm (25°C)
3,610 mPa.s
Dry solids by weight
55.2%
Density
1.38 Kg/l
VOC (EU) incl. water
54.4 g/l
PVC
44.7%
 
Application Properties
(with wire rod on oak veneer , 2 layers)
Gloss 20° / 60° / 85° (GU)
1/4/11
König Hardness (sec) after 24Hrs 50°C
47 Sec

Explore other applications using the Decovery® range of plant-based resins:

Wall paints
Wood Flooring

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Downloads from Bio-based resins for coatings

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