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EP-4739639-A1 - METHOD FOR IMPROVING WORKABILITY OF INORGANIC BINDER COMPOSITION, AND INORGANIC BINDER COMPOSITION

EP4739639A1EP 4739639 A1EP4739639 A1EP 4739639A1EP-4739639-A1

Abstract

[Problem] To provide a method for improving the workability of an inorganic binder composition, and an inorganic binder composition. [Solution] The method of the present invention for improving the workability of an inorganic binder composition comprises: (a) providing a dispersant; (b) providing an inorganic binder composition; and (c) intermilling and/or intermixing the dispersant provided in step (a) and the inorganic binder composition provided in step (b), wherein the dispersant is a phenolic resin-based dispersant that is obtained via polycondensation of specific monomers.

Inventors

  • ODA, Kenta
  • SAITOH, KANAME
  • TAMURA, ATSUSHI
  • ONODA, Noriyuki

Assignees

  • Sika Technology AG

Dates

Publication Date
20260513
Application Date
20240708

Claims (14)

  1. [Chemical Formula 1] (ii) b mol% of a monomer represented by formula (II): [Chemical Formula 2] (iii) c mol% of a monomer represented by formula (III): [Chemical Formula 3] (iv) d mol% of a monomer represented by formula (IV): [Chemical Formula 4] (v) e mol% of an aldehyde, preferably formaldehyde, meta-formaldehyde, paraformaldehyde, or formalin, or a mixture thereof, where R 1 is H or a C1-4 alkyl group or a C2-5 acyl group, R 2 is H, an alkali metal ion, an alkaline earth metal ion, or a moiety having the following structure: [Chemical Formula 5] R 3 is H or O-R 2 , R 4 is H, a C1-4 alkyl group, or a phosphoric acid ester group, R 5 is H, a C1-18 alkyl group, polyisobutene, or a sulfonic acid moiety, A1 and A2 are each independently a CxH2x group, where x=2 to 5, n=1 to 350, m=2 to 300, the a:b:c:d molar ratio is 0.1 to 2.0:0.1 to 6.0:0.1 to 2.0:0.0 to 0.5, and the (a+b+c+d):e molar ratio is 1 : 10 to 10: 1 .
  2. [Claim 2] The method according to Claim 1 , wherein the slag content is at least 70% by mass, preferably at least 80% by mass, and in particular at least 85% by mass, relative to the total dry mass of the inorganic binder.
  3. [Claim 3] The method according to Claim 1 or 2, wherein the slag is steel slag, preferably ground granulated blast-furnace slag, and in particular ground granulated blast furnace slag per the JIS A 6206:2013 standard.
  4. [Claim 4] The method according to Claim 1 or 2, wherein the phenolic resin-based dispersant is intermilled and/or intermixed in an amount of 0.1 to 5% by mass, and preferably 0.5 to 1 % by mass, relative to the total dry mass of the inorganic binder in step (c).
  5. [Claim 5] The method according to Claim 1 or 2, wherein the dispersant is intermilled with the inorganic binder composition in a ball mill or a vertical roll mill in step (c). [Claim 6] The method according to Claim 1 or 2, wherein the inorganic binder composition further comprises at least one polycarboxylic acid-based polymer and/or gluconate. [Claim 7] An inorganic binder composition, comprising the following: (a) 280 to 550 kg/m 3 of slag-containing inorganic binder; (b) 700 to 950 kg/m 3 of fine aggregate, preferably sand, (c) 800 to 1100 kg/m 3 of coarse aggregate, preferably gravel, and (d) 0.1 to 5% by mass, and preferably 0.5 to 1 % by mass, of a dispersant, relative to the total dry mass of the inorganic binder; said inorganic binder composition characterized in that the dispersant is a phenolic resin-based dispersant that is obtained via polycondensation of the following monomers (i) to (v): (i) a mol% of a monomer represented by formula (I):
  6. [Chemical Formula 6] (ii) b mol% of a monomer represented by formula (II):
  7. [Chemical Formula 7] (iii) c mol% of a monomer represented by formula (III): [Chemical Formula 8] (iv) d mol% of a monomer represented by formula (IV): [Chemical Formula 9] (v) e mol% of an aldehyde, preferably formaldehyde, meta-formaldehyde, paraformaldehyde, or formalin, or a mixture thereof, where R 1 is H or a C1-4 alkyl group or a C2-5 acyl group, R 2 is H, an alkali metal ion, an alkaline earth metal ion, or a moiety having the following structure: [Chemical Formula 10] R 3 is H or O-R 2 , R 4 is H, a C1-4 alkyl group, or a phosphoric acid ester group, R 5 is H, a C1-18 alkyl group, polyisobutene, or a sulfonic acid moiety, A1 and A2 are each independently a CxH2x group, where x=2 to 5, n=1 to 350, m=2 to 300, the a:b:c:d molar ratio is 0.1 to 2.0:0.1 to 6.0:0.1 to 2.0:0.0 to 0.5, and the (a+b+c+d):e molar ratio is 1 : 10 to 10: 1 .
  8. [Claim 8] The inorganic binder composition according to Claim 7, wherein the inorganic binder is substantially composed of cement and slag.
  9. [Claim 9] The inorganic binder composition according to Claim 7, wherein said inorganic binder composition furthermore comprises fly ash and/or fine calcium carbonate in addition to the cement and slag.
  10. [Claim 10] The inorganic binder composition according to Claim 8 or 9, wherein the slag-to-cement mass ratio is 2.3: 1 to 6: 1 , and preferably 3:1 to 5: 1 .
  11. [Claim 11] The inorganic binder composition according to Claim 7 or 8, wherein the slag is steel slag, preferably ground granulated blast-furnace slag, and in particular ground granulated blast furnace slag per the JIS A 6206:2013 standard.
  12. [Claim 12] The inorganic binder composition according to Claim 7 or 8, wherein the V funnel flow time per JSCE-F 512:1999 is no more than 10 seconds, as determined 5 minutes after being mixed with water at a water-to-inorganic binder mass ratio of 0.25 to 0.6.
  13. [Claim 13] The inorganic binder composition according to Claim 7 or 8, further comprising at least one polycarboxylic acid-based polymer and/or gluconate.
  14. [Claim 14] A moulded article, obtained by mixing the inorganic binder composition according to Claim 7 or 8 with water in a water-to-inorganic binder mass ratio of 0.25 to 0.6, and then curing the resulting mixture.

Description

METHOD FOR IMPROVING WORKABILITY OF INORGANIC BINDER COMPOSITION, AND INORGANIC BINDER COMPOSITION Technical Field [0001] The present invention relates to a method for improving the workability of an inorganic binder composition, and to an inorganic binder composition. BACKGROUND ART [0002] Recently, industrial byproducts (slag or fly ash) have been pro-actively used as inorganic binders in order to make more efficient use of resources or to mitigate the impact on the environment. [0003] However, the use of slag or fly ash as at least part of the inorganic binder has sometimes compromised the workability or fluidity of the resulting inorganic binder composition. [0004] The use of admixtures such as AE agents and water-reducing agents are known to enhance the workability of inorganic binder compositions like concrete compositions. Polycarboxylic acid-based polymers are widely known as such admixtures, and the recent use of phenolic resin dispersants obtained via polycondensation of a plurality of phenolic co-monomers and aldehydes is also known. [0005] In this regard, Patent Document 1 , for example, proposes an admixture comprising a polycarboxylic acid-based polymer and a phenolic resin-based dispersant that is obtained via polycondensation of a plurality of phenolic co-monomers and aldehydes. According to Patent Document 1 , this sort of admixture curbs the dark discolouration that is caused by the segregation of coloured fine particles (included in hydraulic compositions) on the surface of the cured product, also curbs slow setting, bleeding, and lower initial strength, despite containing an abundance of inorganic powder, and has better water-reducing performance. Prior Art Documents Patent Documents [0006] Patent Document 1 : WO 2018/147378 A1 SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] [0007] As noted above, the use of slag as an inorganic binder has sometimes compromised the workability of the resulting inorganic binder composition, particularly when a relatively high proportion of slag is used as the inorganic binder. [0008] An object of the present invention is thus to provide a method for overcoming such problems, as well as an inorganic binder composition. [Means for Solving the Problems] [0009] As a result of extensive research, the inventors perfected the present invention below upon discovering that the above problems can be solved by means of a specific phenolic resin-based dispersant that is obtained via polycondensation of a plurality of phenolic comonomers and aldehydes. [0010] Embodiment 1 A method for improving the workability of an inorganic binder composition that contains a slag-containing inorganic binder, comprising the following steps (a) to (c): (a) providing a dispersant; (b) providing the inorganic binder composition; and (c) intermilling and/or intermixing the dispersant provided in step (a) and the inorganic binder composition provided in step (b), wherein the dispersant is a phenolic resin-based dispersant that is obtained via polycondensation of the following monomers (i) to (v): (i) a mol% of a monomer represented by formula (I): [Chemical Formula 1] (ii) b mol% of a monomer represented by formula (II): [Chemical Formula 2] \ f (iii) c mol% of a monomer represented by formula (III): [Chemical Formula 3] (iv) d mol% of a monomer represented by formula (IV): [Chemical Formula 4] (v) e mol% of an aldehyde, preferably formaldehyde, meta-formaldehyde, paraformaldehyde, or formalin, or a mixture thereof, where R1 is H or a C1-4 alkyl group or a C2-5 acyl group, R2 is H, an alkali metal ion, an alkaline earth metal ion, or a moiety having the following structure: [Chemical Formula 5] R4 is H, a C1-4 alkyl group, or a phosphoric acid ester group, R5 is H, a C1-18 alkyl group, polyisobutene, or a sulfonic acid moiety, A1 and A2 are each independently a CxH2x group, where x=2 to 5, n=1 to 350, m=2 to 300, the a:b:c:d molar ratio is 0.1 to 2.0:0.1 to 6.0:0.1 to 2.0:0.0 to 0.5, and the (a+b+c+d):e molar ratio is 1 : 10 to 10:1. Embodiment 2 The method according to Embodiment 1 , wherein the slag content is at least 70% by mass, preferably at least 80% by mass, and in particular at least 85% by mass, relative to the total dry mass of the inorganic binder. Embodiment 3 The method according to Embodiment 1 or 2, wherein the slag is steel slag, preferably ground granulated blast-furnace slag, and in particular ground granulated blast furnace slag per the JIS A 6206:2013 standard. Embodiment 4 The method according to any of Embodiments 1 to 3, wherein the phenolic resin-based dispersant is intermilled and/or intermixed in an amount of 0.1 to 5% by mass, and preferably 0.5 to 1 % by mass, relative to the total dry mass of the inorganic binder in step (c). Embodiment 5 The method according to any of Embodiments 1 to 4, wherein the dispersant is intermilled with the inorganic binder composition in a ball mill or a vertical roll mill in step (c). Embodiment 6 The