All posts tagged Environment

PLA-PPG-PU Block Copolymers

Title: LACTIDE COPOLYMER, METHOD FOR PREPARING SAME, AND RESIN COMPOSITION COMPRISING SAME

Number/Link:US2015/0284516

Applicant/Assignee: LG Chem

Publication date: 8-10-2015 (Priority PCT/KR)

“Gist”: Polyether-polylactide block copolymers are prepared using ROP and then extended with isocyanates

Why it is interesting: Polylactic acid (PLA) is a well known renewable and biodegradable polymer often used in the form of films or sheets for disposable packaging. The polymer is however not very flexible and the films have poor mechanical properties. According to this invention both flexibility and mechanical properties can be greatly improved by making polyether-polylactide copolymers and then extending these using an isocyanate with a functionality of more than 2. The copolymers are made by ring-opening polymerization of lactide monomer using a polyether diol as a ‘macro’ initiator together with a specific catalyst. In the examples an excess L-lactide monomer is used which is reacted with a 4000 to 6000 mole weight polypropylene glycol, resulting in a block copolymer with a Mw of more than 100,000. The block copolymer is then reacted with a mixture of MDI and hexamethylenediisocyanate isocyanurate, after which the residual lactide is removed.

L-Lactide

Insulating Wood-Aerogel Composites

Title: REINFORCED ORGANIC NATURAL FIBER COMPOSITES

Number/Link: WO2015/144267

Applicant/Assignee: Huntsman

Publication date: 1-10-2015

“Gist”: Aerogel particles are incorporated in composite wood boards

Why it is interesting: Composite wood products (OSB, MDF..) are well known and popular construction materials which are produced by compressing wood fibers (or flakes and the like) together with a binder like e.g. a polymeric MDI. Typically these materials show thermal conductivity values of about 50 mW/m.K at densities of around 200 kg/m³. According to this invention these insulation values can be significantly improved by incorporating (a large amount of) hydrophobic nanoporous particles and binding the composite with an in-water emulsified isocyanate. In the examples silica aerogel particles and wood fibers are mixed an bonded with an emulsifiable MDI. The amount of particles ranges from about 25 to 50% (w/w) resulting in composites with densities below 200 kg/m³ and insulation values of about 20 to 30 mW/mK.

Medium density fibreboard (MDF).

3 Comments

by Gerhard Bleys on October 2, 2015 • Permalink

Posted in Adhesives-Coatings, composites

Tagged acoustics, aerogel, bio-based materials, composites, Construction, dispersions, energy, Environment, hydrophobic, Insulation, nano, nanoporous, renewable materials, silica

Posted by Gerhard Bleys on October 2, 2015

https://purpatents.com/2015/10/02/insulating-wood-aerogel-composites/

Aerogels from Urethane-Acrylate Star Monomers

Title: FLEXIBLE TO RIGID NANOPOROUS POLYURETHANE-ACRYLATE (PUAC) TYPE MATERIALS FOR STRUCTURAL AND THERMAL INSULATION APPLICATIONS

Number/Link:US2015/0266983

Applicant/Assignee: University of Missouri

Publication date: 24-09-2015

“Gist”: A trifunctional acrylate-ended urethane monomer is polymerized in solvent and supercritically dried

Why it is interesting: Research related to nanoporous materials has been gaining significant momentum in recent years and both inorganic (usually silica-based) and organic (e.g resorcinol-formaldehyde or polyurethane -based) aerogels are increasingly being used especially for thermal insulation applications. The current invention relates to hybrid PU-AC aerogels prepared from acrylate functional “star” monomers. The monomers are made by reacting a tris(isocyanatoaryl)methane with one or more hydroxyacrylates in a suitable solvent. The monomer is then radically polymerized and the resulting ‘wet’ gel is supercritically dried into an aerogel. In the examples tris(4-isocyanatophenyl)methane is reacted with 2-hydroxyethylacrylate in ethyl acetate. The monomer solution is polymerized by heating with a radical initiator and the resulting gel is then dried using acetone and supercritical CO2. The resulting aerogels have a density ranging from about 135 to 650 kg/m³ with a porosity bewteen 90 and 50% (v/v). The lower density aerogels are flexible and have a thermal conductivity of about 40 mW/m.K.

Star monomer according to the invention

Innovation in Polyurethanes

All posts tagged Environment

PLA-PPG-PU Block Copolymers

Insulating Wood-Aerogel Composites

Aerogels from Urethane-Acrylate Star Monomers

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