All posts by Gerhard Bleys

Polyurethane Coating for Frac Tanks

Title: SPRAYABLE POLYURETHANE BASED PROTECTIVE COATING

Number/Link: WO2015/050811

Applicant/Assignee: Dow

Publication date: 9-04-2015

“Gist”: Use of butylene oxide polyols in sprayable coating composition

Why it is interesting: The hydraulic fracturing fluids used in ‘fracking’ operations are stored and transported in so-called ‘frac tanks’. Because fracking fluids can contain highly corrosive compounds such as HCl and solvents such as toluene and xylene, the tanks need a protective coating with a high chemical resistance. According to this application such a coating can be accomplished using a sprayable 2 component system comprising polyols with a high butylene oxide (BO) content, e.g. polyols prepared from 80% butylene oxide and 20% propylene oxide (PO) with a molecular weight of about 2000 and a functionality of 2. In the first component the BO/PO polyol is prepolymerized with an isocyanate e.g. MDI, while used as such in the second component. The two components are prepared such that they both show a similar viscosity of less than 1500 cP at 25°C, so that the coating composition is sprayable.

Frac tank.

Superhydrophobic Polyurethane Coatings

Title: POLYMERS FOR MAKING SUPERHYDROPHOBIC SURFACES

Number/Link: WO2015/047196

Applicant/Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH

Publication date: 2-04-2015

“Gist”: A comb polymer with hydrophobic side chains and an isocyanate-reactive backbone is reacted with an NCO-ended prepolymer.

Why it is interesting: Superhydrophobic surfaces show a contact angle (vs water) of 150° or more. Water therefore forms almost perfectly spherical droplets on such a surface which easily roll off: the so-called “lotus-effect”. Superhydrophobic surfaces can find important applications in e.g. automotive and aviation industries. The current invention relates to a superhydrophobic coating composition comprising a hydrophobic comb-polymer having an NCO-reactive backbone together with a polyurethane prepolymer. The comb polymer is prepared by alkylating an unsaturated epoxy monomer with a nucleophile comprising a C8 to C20 alkyl group, followed by polymerization. The resulting comb polymer can then be combined with an NCO-ended polyurethane prepolymer to make a superhydrophobic coating composition. In an example hexadecylamine is reacted with glycidylmethacrylate resulting in 3-(hexadecylamino)-2-hydroxypropylmethacrylate which is then polymerized into a comb-like polymer. After separation and drying the comb polymer is combined with a commercial (solvent-based) polyurethane prepolymer to make the coating composition.

Glycidylmethacrylate

Flexible Foams Containing PPE Polyols

Title: POLYURETHANE FOAM AND ASSOCIATED METHOD AND ARTICLE

Number/Link: WO2015/041905

Applicant/Assignee: SABIC

Publication date: 26-03-2015

“Gist”: Use of poly(phenylene ether) polyols in flexbile foams

Why it is interesting: As expected Sabic continue their series on the use of poly(phenylene ether) in polyurethane materials. This application is about the use of (some) PPE polyol in flexible foams. The resulting foams are said to have improved hardness, tear- and tensile strength. In the examples 10 to 40% of a PPE diol (on total polyol) is used together with other polyols, MDI or TDI and water as blowing agent, resulting in flexible foams with densities ranging from about 25 to 50 kg/m³. The PPE diol is a copolymer of 2,6-dimethylphenol and 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane with an equivalent weight of about 1000.

PPE diol used in the invention. Q5 and Q6 pare methyl.

PPE diol used in the invention. Q5 and Q6 are methyl groups.

Innovation in Polyurethanes

All posts by Gerhard Bleys

Polyurethane Coating for Frac Tanks

Superhydrophobic Polyurethane Coatings

Flexible Foams Containing PPE Polyols

Pages

Categories

Search

Follow this blog via email