Biobased membrane

Patent metadata

Field	Value
Publication number	US-2016251533-A1
Application number	US-201615082965-A
Country	US
Kind code	A1
Filing date	Mar 28, 2016
Priority date	Oct 3, 2013
Publication date	Sep 1, 2016
Grant date	—

Abstract

A composition for forming a bio-compatible membrane applicable to building material, such as concrete, cement, etc., to a method of applying said composition for forming a biocompatible membrane, a biocompatible membrane, use of said membrane for various purposes, and to building material comprising said membrane.

First claim

What is claimed is:

1 . A method of forming a bio-compatible membrane comprising the steps of:
providing a composition comprising (i) water, (ii) (a) a water-soluble anionic bio-degradable polymer and/or a synthetic acid polymer, and/or (ii) (b) one or more of an in water dissolvable silicate, either as such or in parts thereof, wherein the bio-degradable polymer and/or the synthetic acid polymer are/is in an amount of 1.5-64 wt. %, and/or the one or more silicate are/is in an amount of 0.01-18 wt. %, wherein the nanoparticles are in an amount of 0.01-64 wt. %, based on a total weight of the composition, with the proviso that if silicate is present, also nanoparticles are present, applying the composition onto a surface, the surface providing polyvalent cations, and reacting the (ii) (a) bio-degradable polymer and/or (ii) (b) silicate, and polyvalent cations, thereby forming a membrane layer on the surface.

2 . The method according to claim 1 , wherein the composition comprises (iii) platelet nanoparticles, wherein the nanoparticles are in an amount of 0.01-64 wt. %, based on a total weight of the composition, with the proviso that if silicate is present, also nanoparticles are present.

3 . The method according to claim 1 , wherein the surface is pre-treated and/or pre-shaped.

4 . The method according to claim 1 , wherein the surface is one or more of concrete, cement material, and brick.

5 . The method according to claim 1 , wherein the polymer is Na-alginate, wherein the clay is Na-montmorillonite, and wherein the composition is applied in an amount of 1-1000 ml/m 2 .

6 . The method according to claim 1 , wherein the composition is applied at least once by one or more of spraying, brushing, nebulizing, and pouring, and wherein the composition is applied directly after casting cement or concrete.

7 . The method of protecting a surface from degradation by performing a method according to claim 1 , wherein the surface is protected from one or more of drying, oxidizing, such as corroding, wearing, fouling, and dehydrating.

8 . A stiff coating comprising polyvalent cations, water, and one or more of an in water dissolvable silicate and platelet nanoparticles, obtained by a method according to claim 1 .

9 . A flexible coating comprising polyvalent cations, water, and bio-degradable polymers, obtained by a method according to claim 1 .

10 . A recoverable flexible polymer coating according to claim 9 , wherein the coating is applied in an environment comprising algae.

11 . One or more of concrete, cement material, and brick, comprising a water impermeable flexible polymer coating according to claim 9 .

12 . An aqueous composition for forming a bio-compatible membrane comprising:
(i) water, (ii) (a) a water-soluble anionic bio-degradable polymer, and/or a water-soluble synthetic acid polymer, wherein the polymer is capable of forming a gel in contact with polyvalent cations under ambient conditions, the polymer being dissolved in the liquid, and/or (ii) (b) one or more of an in water dissolvable cyclic and single chain silicate (SiO 2+n 2n− ), pyrosilicate (Si 2 O 7 6− ), and components that form a silicate, wherein the silicate is capable of forming a glassy structure in contact with polyvalent cations under ambient conditions, and (iii) platelet nanoparticles, the nanoparticles being suspended in the liquid, wherein the bio-degradable polymer and/or the synthetic acid polymer are/is in an amount of 1.5-64 wt. %, wherein the one or more silicate are/is in an amount of 0.01-18 wt. %, and wherein the nanoparticles are present in an amount of 0.01-64 wt. %, based on a total weight of the composition.

13 . The composition according to claim 12 , wherein an amount (wt. %) of polymer and/or silicate is larger than an amount of nanoparticle.

14 . The composition according to claim 12 , wherein
(ii) the polymer is one or more of an anionic polysaccharide, poly vinyl alcohol, poly (meth)acryl amide, acidic polymer, poly styrene sulphonate, poly (meth)acrylic acid, acidic biopolymers, pectin, carrageenan, gelatine, a synthetic acid polymer, and wherein the polyvalent cation is one or more of calcium, iron, copper, strontium, cobalt, aluminium, zinc, magnesium, and nickel.

15 . The composition according to claim 12 , wherein
(iii) the nanoparticles are one or more of a natural or artificial clay, a silicate mineral, and platelet like polymers, and
wherein the nanoparticles are present in an amount of 0.1-50 wt. %.

16 . A use of a composition comprising:
(i) water, (ii) (a) a water-soluble anionic bio-degradable polymer and/or a synthetic acid polymer, and/or (ii) (b) one or more of an in water dissolvable silicate, and wherein the bio-degradable polymer and/or the synthetic acid polymer are/is in an amount of 1.5-64 wt. %, and/or the one or more silicate are/is in an amount of 0.01-18 wt. %, either as such or in parts thereof, and/or of a flexible polymer coating according to claim 9 ,
for one or more of improving setting of concrete, protecting concrete or cement material from degradation, and as anti-graffiti coating.

17 . The use according to claim 16 , wherein the composition comprises:
(iii) platelet nanoparticles, wherein the nanoparticles are in an amount of 0.01-64 wt. %, based on a total weight of the composition, with the proviso that if silicate is present, also nanoparticles are present.

Assignees

• Univ Delft Tech
• Stichting Technische Wetenschappen

Inventors

• Koenders Eduardus Aloysius Bernardus
• Zlopasa Jure
• Picken Stephen James

Classifications

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C04B2111/74

  Underwater applications · CPC title

• C09D5/1656

  characterised by the film-forming substance (C09D5/1637 takes precedence) · CPC title

• C09D105/00

  Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00 · CPC title

• C04B41/4803

  Polysaccharides, e.g. cellulose, or derivatives thereof · CPC title