Additive containing a superplasticizer and a copolymer

Patent metadata

Field	Value
Publication number	US-10689303-B2
Application number	US-201615762954-A
Country	US
Kind code	B2
Filing date	Sep 22, 2016
Priority date	Sep 24, 2015
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

The present invention relates to admixtures, especially a dispersant for solid particles, in particular a dispersant for mineral binder compositions, comprising:
a) a superplasticizer and b) a copolymer having a polymer backbone and side chains bonded thereto, comprising at least one ionizable monomer unit M1 and at least one side chain-bearing monomer unit M2, wherein the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone, and wherein the superplasticizer and the copolymer differ from a chemical and/or structural point of view.

First claim

The invention claimed is:

1. An admixture comprising:
a) a superplasticizer and
b) a copolymer having a polymer backbone and side chains bonded thereto, the copolymer comprising:
at least one ionizable monomer unit M1 and
at least one side chain-bearing monomer unit M2,

wherein:
the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone,
the superplasticizer and the copolymer differ from a chemical and/or structural point of view, and
the superplasticizer comprises the following substructure units:
a) a molar parts of a substructure unit S1 of formula I

b) b molar parts of a substructure unit S2 of formula II

c) c molar parts of a substructure unit S3 of formula (III)

d) d molar parts of a substructure unit S4 of formula (IV)

where:
L independently represents H + , an alkali metal ion, an alkaline earth metal ion, a di- or trivalent metal ion, an ammonium ion or an organic ammonium group,
each R u independently of any other is hydrogen or a methyl group,
each R v independently of any other is hydrogen or —COOM,
r=0, 1, or 2,
t=0 or 1,
G 1 and G 2 are each independently a C 1 - to C 20 -alkyl group, -cycloalkyl group, -alkylaryl group, or -[A′O] s -G 4 , where A′=C 2 - to C 4 -alkylene, G 4 is H, a C 1 - to C 20 -alkyl group, -cycloalkyl group, or -alkylaryl group, and s=2-250,
G 3 is independently —NH 2 , —NG 5 G 6 , or —OG 7 NG 8 G 9 ,
where:
G 5 and G 6 are each independently
a C 1 - to C 20 -alkyl group, -cycloalkyl group, -alkylaryl group, or -aryl group, or
are a hydroxyalkyl group, an acetoxyethyl group (CH 3 —CO—O—CH 2 —CH 2 —), a hydroxyisopropyl group (HO—CH(CH 3 )—CH 2 ), or an acetoxyisopropyl group (CH 3 —CO—O—CH(CH 3 )—CH 2 —); or
G 5 and G 6 together form a ring, which includes the nitrogen, in order to form a morpholine or imidazoline ring;
G 7 is a C 2 -C 4 -alkylene group,
G 8 and G 9 each independently represents a C 1 - to C 20 -alkyl group, -cycloalkyl group, -alkylaryl group, -aryl group, or a hydroxyalkyl group, and

a, b, c and d represent molar proportions of the respective substructure units S1, S2, S3 and S4,
a/b/c/d=(0.1-0.9)/(0.1-0.9)/(0-0.8)/(0-0.8), and
with the proviso that a+b+c+d=1.

2. An admixture comprising:
a) a superplasticizer and
b) a copolymer having a polymer backbone and side chains bonded thereto, the copolymer comprising:
at least one ionizable monomer unit M1 and
at least one side chain-bearing monomer unit M2,

wherein:
the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone,
the copolymer is a block copolymer, wherein the ionizable monomer units M1 are present essentially in at least one first block A and the side chain-bearing monomer units M2 essentially in at least one second block B, and
the superplasticizer and the copolymer differ from a chemical and/or structural point of view.

3. An admixture comprising:
a) a superplasticizer and
b) a copolymer having a polymer backbone and side chains bonded thereto, the copolymer comprising:
at least one ionizable monomer unit M1 and
at least one side chain-bearing monomer unit M2,

wherein:
the copolymer has a nonrandom distribution of the monomer units M1 and/or the monomer units M2 in a direction along the polymer backbone,
the copolymer has a gradient structure in at least one section AA in a direction along the polymer backbone with respect to the ionizable monomer unit M1 and/or with respect to the side chain-bearing monomer unit M2, and
the superplasticizer and the copolymer differ from a chemical and/or structural point of view.

4. The admixture as claimed in claim 2 , wherein the ionizable monomer unit M1 in the copolymer has a structure of formula VI

and the side chain-bearing monomer unit M2 includes a structure of formula VII

where:
R 1 , in each case independently, is —COOM, —SO 2 —OM, —O—PO(OM) 2 , or —PO(OM) 2 ,
R 2 , R 3 , R 5 and R 6 , in each case independently, are H or an alkyl group having 1 to 5 carbon atoms,
R 4 and R 7 , in each case independently, are H, —COOM, or an alkyl group having 1 to 5 carbon atoms, or
R 1 forms a ring together with R 4 to give —CO—O—CO—,
M, independently of one another, represents H + , an alkali metal ion, an alkaline earth metal ion, a di- or trivalent metal ion, an ammonium ion or an organic ammonium group;
m=0, 1 or 2,
p=0 or 1,
X, in each case independently, is —O— or —NH—,
R 8 is a group of formula -[AO] n -R a , where A=C 2 - to C 4 -alkylene, R a is H, a C 1 - to C 20 -alkyl group, -cycloalkyl group, or -alkylaryl group, and

n=2-250.

5. The admixture as claimed in claim 2 , wherein the copolymer comprises at least one further monomer unit MS of formula VIII:

where:
R 5′ , R 6′ , R 7′ , m′ and p′ are as defined for R 5 , R 6 , R 7 , m and p as in claim 4 ;
Y, in each case independently, is a chemical bond or —O—;
Z, in each case independently, is a chemical bond, —O— or —NH—; and
R 9 , in each case independently, is an alkyl group, cycloalkyl group, alkylaryl group, aryl group, hydroxyalkyl group, or acetoxyalkyl group, each having 1-20 carbon atoms.

6. The admixture as claimed in claim 3 , wherein the copolymer, in addition to the at least one section AA having a gradient structure, has a further section AB, wherein there is essentially a constant local concentration of the monomers and/or a random distribution of the monomers over the entire section AB.

7. The admixture as claimed in claim 1 , wherein a polydispersity of the copolymer is <1.5.

8. The admixture as claimed in claim 1 , wherein a molar ratio of the monomer units M1 to the monomer units M2 in the copolymer is in the range of 0.5-6.

9. The admixture as claimed in claim 4 , wherein:
R 1 =COOM;
R 2 and R 5 , independently of one another, are H, —CH 3 , or mixtures thereof;
R 3 and R 6 , independently of one another, are H or —CH 3 ,
R 4 and R 7 , independently of one another, are H or —COOM; and
X in at least 75 mol %, of all monomer units M2 is —O—.

10. A method for dispersing solid particles, comprising mixing an admixture as claimed in claim 1 with solid particles.

11. A mineral binder composition, comprising at least one admixture as claimed in claim 1 .

12. A shaped body, obtained by curing a mineral binder composition as claimed in claim 11 after addition of water.

13. The admixture as claimed in claim 3 , wherein the ionizable monomer unit M1 i

Assignees

• Sika Tech Ag

Inventors

• Weidmann Jürg
• Frunz Lukas
• Zimmermann Jörg

Classifications

• C04B40/0039 Primary

  Premixtures of ingredients · CPC title

• C04B2103/308

  Slump-loss preventing agents · CPC title

• C04B2103/0063

  obtained by an unusual polymerisation process, e.g. by changing the molar ratio of the different monomers during the polymerisation process (C04B2103/0058 - C04B2103/0061 take precedence) · CPC title

• C04B2103/0061

  Block (co-)polymers · CPC title

• C04B40/0042 Primary

  Powdery mixtures · CPC title