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CNSL Polyols and Diols

HYDROPHOBICITY WITH RENEWABLE TECHNOLOGY

Cardolite offers a line of renewable, cashew nutshell liquid (CNSL) based polyols that have unique qualities compared to widely known polyester and polyether polyols, and other natural oil based polyols. CNSL polyols and diols are very hydrophobic because of the long aliphatic chain of cardanol, and fewer ether oxygen atoms compared to typical polyether polyols (less hydrophilic). This hydrophobicity provides excellent water resistance and less moisture sensitivity during cure with isocyanate for increased durability of the final polyurethane system.

The experiment shown on this page is an attempt to quantify the relative water resistance in PU systems of different polyols and diols. When NCO reacts with water, it releases CO2. Other than in moisture cured systems, the reaction of NCO with water is undesirable, and the goal is to react the NCO only with the polyol. In this test, a mixture of polyol/NCO (Index 100) is poured over the same amount of water and the amount of CO2 released is measured. The results indicate CNSL diols and CNSL polyols are more hydrophobic than PPG diols and castor-based polyols, respectively. NX-9201 is very close to PolyBD in performance, but at lower price.

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CHEMICAL RESISTANCE AND HYDROLYTIC STABILITY

Different from other renewable polyols obtained from soy and castor oil, CNSL polyols have an aromatic structure that translates into excellent thermal resistance and chemical resistance to acid and alkaline solutions. Moreover, the combination of aromaticity and long aliphatic chain delivers hydrolytic stability and mechanical strength to CNSL based polyols.

Hydrolytic stability is a key benefit offered by CNSL diols. Prepolymers based on diols from different chemistries were immersed in 3 different solutions, water, sodium hydroxide, and sulfuric acid for 21 days at RT. The hardness was measured before and after exposure and the data in the graph indicates the change in hardness. NX-9203 showed the best performance amongst all systems and NX-9201 performed similarly to PolyBD and polycarbonate diols. PPGs showed the worse hydrolytic stability.

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ALTERNATIVE TO POLYBUTADIENE DIOLS

NX-9203 and NX-9203LP bring value as full or partial replacements for polybutadiene (PolyBD) diols. Similarly to PolyBD diols, NX-9203/NX-9203LP offer excellent hydrophobicity and hydrolytic stability. The good compatibility between the two types of diols enables for blends that provide even better properties than each diol by itself. Those systems show very good mechanical and bonding properties.

NX-9203LP PolyBD Formulations

WIDE RANGE OF PROPERTIES AND PERFORMANCE

CNSL polyols can be designed for varied applications and functionalized to achieve a wide range of properties. Cardolite polyol product line consists of diols, and medium and high functionality polyols. CNSL diols combine the benefits of CNSL and Polyester technologies resulting in excellent solvent, alkaline, acid, and water resistance, and high physical properties such as tensile strength. CNSL diols can be formulated as is or as a building block for prepolymers. CNSL Mannich polyols have medium to high functionality and provide fast reactivity, high compression strength and improved fire and thermal resistance properties. Other medium and high functionality polyols include CNSL novolacs and specially modified polyols deliver high overall strength and hydrophobicity. Furthermore, light color CNSL polyols have been developed based on Cardolite’s new Ultra LITE process technology.

CNSL polyols are suitable for 2k ambient cured coatings and adhesives, 1k blocked or moisture cured adhesives and sealants, and rigid and flexible foam applications. The following table contains CNSL polyols and diols currently available from Cardolite.

 

POLYOLS AND DIOLS PROPERTIES

ProductDescriptionColor (Gardner)Avg. OH value (mg KOH/g)Viscosity 25°C (cps)PropertiesApplicationsDocuments
LITE 9001CNSL Novolac Polyol61752000Light version of NX-9001. Fast cure.CASE, Flexible Foam, Rigid FoamTDS MSDS (USA) MSDS (EU)
NX-9001CNSL Novolac Polyol181752000Excellent water and alkaline resistance, good mechanical and fire resistance propertiesCASE, Flexible Foam, Rigid FoamTDS MSDS (USA) MSDS (EU)
NX-9001LVCNSL Novolac Polyol181751000Low viscosity version of NX-9001CASE, Flexible Foam, Rigid Foam TDS MSDS (USA) MSDS (EU)
NX-9004CNSL Polyol18+1855250EU REACH Compliant version of NX-5285.Rigid FoamTDS MSDS (USA) MSDS (EU)
NX-5285CNSL Polyol18+2002500Fast cure, cost effective, good mechanical and fire resistance properties and low water absorptionRigid FoamTDS MSDS (USA) MSDS (EU)
NX-9005Non-CNSL Branched Polyol51703000High strength and elongation, light color, good water resistanceCASETDS MSDS (USA) MSDS (EU)
GX-9006CNSL Novolac Polyol152053000Lower reactivity, good mechanical and fire resistance propertiesRigid Foam TDS MSDS (USA) MSDS (EU)
NX-9007CNSL Branched Polyol141752900High strength and elongation, good water resistanceCASETDS MSDS (USA) MSDS (EU)
NX-9008CNSL Polyether Polyol103404000High Tg, excellent mechanical properties and bond strengthAdhesives and SealantsTDS MSDS (USA) MSDS (EU)
NX-9011Non-CNSL Branched Polyol≤ 52251,850Excellent hardness and toughness with good flexibilityCASETDS MSDS (USA)
NX-9014Non-CNSL Branched Polyol≤ 52601,200Excellent UV resistance and bond strength on various metalsCASETDS MSDS (USA)
MSDS (EU)
GX-9101CNSL Mannich Polyol154202500Good mechanical properties, fire performance and thermal stabilityRigid Foam (spray foam)TDS MSDS (USA) MSDS (EU)
GX-9102CNSL Mannich Polyol154407750High reactivity, good mechanical properties and fire performanceRigid Foam (spray foam)TDS MSDS (USA) MSDS (EU)
GX-9103CNSL Mannich Polyol1547510500High reactivity,ood mechanical properties and fire performanceRigid Foam (spray foam)TDS MSDS (USA) MSDS (EU)
GX-9104CNSL Mannich Polyol152455500Medium reactivitY, good mechanical properties and fire performanceRigid FoamTDS MSDS (USA) MSDS (EU)
NX-9201CNSL Polyester Diol14721400Excellent water, acid and alkaline resistance. CASE, Flexible FoamTDS MSDS (USA) MSDS (EU)
NX-9203CNSL Polyester Diol14982650Excellent water, acid and alkaline resistance, hydrolytic stability, and compatibility with polyether and Poly BD. CASE, Flexible FoamTDS MSDS (USA) MSDS (EU)
NX-9201LPCNSL Polyester Diol14701300Lower reactivity version of NX-9201, suitable for prepolymer makingCASE, Flexible FoamTDS MSDS (USA) MSDS (EU)
NX-9203LPCNSL Polyester Diol141002000Lower reactivity version of NX-9203, suitable for prepolymer makingCASE, Flexible FoamTDS MSDS (USA) MSDS (EU)
NX-9207Non-CNSL Polyester DiolPale yellow 132Waxy solidHigh strength, light color, suitable for prepolymer makingCASETDS MSDS (USA) MSDS (EU)
NX-9208CNSL Polyester DiolPale brown 78Waxy solidHigh strength, excellent hydrolytic stability, suitable for prepolymer makingCASETDS MSDS (USA) MSDS (EU)
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