Dry particulate compositions for the formation of geopolymers, a process for forming geopolymers and the geopolymers obtained as a result

Patent metadata

Field	Value
Publication number	US-2021284577-A1
Application number	US-201716323348-A
Country	US
Kind code	A1
Filing date	Jul 17, 2017
Priority date	Aug 5, 2016
Publication date	Sep 16, 2021
Grant date	—

Abstract

The invention concerns dry particulate compositions for forming a geopolymer, comprising an aluminosilicate containing mineral, a polymeric additive, an alkali metal silicate, and an alkali metal hydroxide. The invention concerns processes of making geopolymers, the geopolymers, as well as the use of the dry particulate compositions in the formation of geopolymers.

First claim

1 . A dry particulate composition for forming a geopolymer, comprising:
an aluminosilicate containing mineral, a polymeric additive, an alkali metal silicate, and an alkali metal hydroxide.

2 . A dry particulate composition according to claim 1 , in which:
the amorphous phase content of the aluminosilicate-polymeric additive mixture is at least 30% by weight, and the result of the specific surface area in m 2 /g multiplied by the amorphous phase content of the said mixture falls in the range 1 to 18.

3 . A dry particulate composition according to claim 1 , comprising:
25% to 79% by weight of aluminosilicate, 5% to 30% by weight of polymeric additive, 15% to 50% by weight of alkali metal silicate, and 1% to 25% by weight of alkali metal hydroxide,
with the percentages being expressed in proportion to the total weight of the dry particulate composition.

4 . A dry particulate composition according to claim 1 , wherein the amorphous phase content of the aluminosilicate-polymeric additive mixture is at least 45% by weight.

5 . A dry particulate composition according to claim 1 , in which the aluminosilicate is chosen from the group consisting of metakaolin, fly ash, halloysite, meta-halloysite, slag, pulverised rock, fine sand, activated clay, kaolin, mica, fine feldspar, and their mixtures.

6 . A dry particulate composition according to claim 1 , in which the polymeric additive is chosen from the group consisting of polyethylenes (PE), polypropylenes (PP), thermoplastic urethanes (TPU), styrene-butadiene styrenes (SBS), styrene ethylene butadiene styrenes (SEBS), polyesters, polyethylene terephthalates (PET), high-density polyethylenes (HDPE), low-density polyethylenes (LDPE), polyvinyl chlorides (PVC), polyvinylidene chlorides (PVDC), polystyrenes, polyamides, acrylonitrile butadiene styrenes (ABS), maleimide/bismaleimides, melamine formaldehydes, phenol formaldehydes, polyepoxides, polyetheretherketones (PEEK), polyetherimides, polyimides, polylactic acids (PLA), polymethyl methacrylates (PMMA), polytetrafluoroethylenes (PTFE), urea-formaldehydes, furans, silicones, polysulfones, and mixtures thereof.

7 . A dry particulate composition according to claim 1 , wherein the polymeric additive is a polyolefin.

8 . A dry particulate composition according to claim 1 , in which the alkali metal of the alkali metal silicate is chosen from the group consisting of Na, K, Li, Rb, Cs and their mixtures.

9 . A dry particulate composition according to claim 1 , in which the alkali metal hydroxide is chosen from the group consisting of NaOH, KOH, LiOH, RbOH, CsOH and their mixtures.

10 . A process for the preparation of a geopolymer comprising or consisting of the addition of a defined quantity of water to a dry particulate composition according to claim 1 .

11 . The process for the preparation of a geopolymer of claim 10 , wherein the the quantity of water added to the dry particulate compositions is less than or equal to 50% by weight.

12 . The process for the preparation of a geopolymer of claim 10 , wherein the quantity of water added to the dry particulate compositions ranges from 10% to 50% by weight.

13 . A geopolymer comprising a dry particulate composition according to claim 1 .

14 . A method comprising combining an aluminosilicate containing mineral, a polymeric additive, an alkali metal silicate, and an alkali metal hydroxide to prepare a dry particulate composition to form a for use in forming a geopolymer.

15 . A dry particulate composition according to claim 1 , wherein
the polymeric additive is a polyolefin; the alkali metal of the alkali metal silicate is chosen from the group consisting of Na, K, Li, Rb, Cs and their mixtures; and the alkali metal hydroxide is chosen from the group consisting of NaOH, KOH, LiOH, RbOH, CsOH and their mixtures.

16 . A dry particulate composition according to claim 15 , wherein the aluminosilicate is chosen from the group consisting of metakaolin, fly ash, halloysite, meta-halloysite, slag, pulverised rock, fine sand, activated clay, kaolin, mica, fine feldspar, and their mixtures.

17 . A dry particulate composition according to claim 16 , wherein the amorphous phase content of the aluminosilicate-polymeric additive mixture is at least 45% by weight.

18 . A dry particulate composition according to claim 16 , comprising:
25% to 79% by weight of aluminosilicate, 5% to 30% by weight of polymeric additive, 15% to 50% by weight of alkali metal silicate, and 1% to 25% by weight of alkali metal hydroxide,
with the percentages being expressed in proportion to the total weight of the dry particulate composition.

19 . A dry particulate composition according to claim 18 , wherein the amorphous phase content of the aluminosilicate-polymeric additive mixture is at least 45% by weight.

Assignees

• Imertech Sas

Inventors

• Autef Alexandre

Classifications

• C04B40/0042

  Powdery mixtures · CPC title

• C04B28/006 Primary

  containing mineral polymers, e.g. geopolymers of the Davidovits type · CPC title

• C04B24/2611

  Polyalkenes · CPC title

• C04B28/26 Primary

  Silicates of the alkali metals · CPC title

• C04B22/062

  of the alkali or alkaline-earth metals · CPC title