Copolymers for avoiding deposits in water supply systems, production and use thereof
View Patent ↗The invention relates to copolymers made from monoethylenically unsaturated monomers with acid groups and a further hydrophobic monomer component for the prevention of inorganic and organic deposits in water supply systems. The invention further relates to a method for production of the above.
1. A clear, water-soluble copolymer derived from a monomer composition, comprising:
a 1 ) a monoethylenically unsaturated, acid-group-containing monomer selected from the group consisting of monocarboxylic acids and dicarboxylic acids;
a 2 ) a monoethylenically unsaturated sulfonic acid; and
b) a copolymerizable hydrophobic monocyclic terpene hydrocarbon;
wherein the copolymer is formed by radical copolymerization of components a 1 ), a 2 ) and b) in an aqueous phase and the proportion of component b) in the copolymer ranges from 0.2 to <20 wt %.
2. The copolymer according to claim 1 , wherein the monoethylenically unsaturated, acid-group-containing monomer comprises a monoethylenically unsaturated monocarboxylic acid.
3. The copolymer according to claim 1 , wherein the acid-group-containing monomer is a member selected from the group consisting of acrylic acid, methacrylic acid and vinylacetic acid.
4. The copolymer according to claim 1 , wherein the acid groups in the monomer are neutralized in a proportion of 1 to 75%.
5. The copolymer according to claim 4 , wherein the acid groups in the monomer are neutralized in a proportion of 5 to 30%.
6. The copolymer according to claim 1 , further comprising up to 40 wt % of an acid-group-free, water-soluble monomer.
7. The copolymer according to claim 1 , having a weight-average molecular weight of smaller than or equal to 500,000 g/mol.
8. The copolymer according to claim 7 , having a weight-average molecular weight ranging from 1,000 and 10,000 g/mol.
9. A method for synthesis of a clear, water-soluble copolymer of:
a 1 ) a monoethylenically unsaturated, acid-group-containing monomer selected from the group consisting of monocarboxylic acids and dicarboxylic acids
a 2 ) a monoethylenically unsaturated sulfonic acid, and
a copolymerizable hydrophobic monocyclic terpene hydrocarbon, comprising:
forming the copolymer by radical polymerization of the monomer components in the aqueous phase.
10. The method according to claim 9 , wherein the concentration of the copolymerizable constituents in the aqueous polymerization mixture is 10 to 70 wt %.
11. The method according to claim 9 , wherein component b) is in the form of an oil-in-water emulsion that is formed from a hydrophobic phase (oil phase), at least one emulsifier and water.
12. The method according to claim 9 , wherein the radical polymerization is carried out in the presence of molecular-weight regulators.
13. A method for preventing organic, inorganic and mixed organic/inorganic deposits in a water-conveying system, comprising:
applying to the system an effective amount of a clear, water-soluble copolymer of
a 1 ) a monoethylenically unsaturated, acid-group-containing monomer selected from the group consisting of monocarboxylic acids and dicarboxylic acids;
a 2 ) a monoethylenically unsaturated sulfonic acid, and
a copolymerizable hydrophobic monocyclic terpene hydrocarbon,
wherein the copolymer is formed by radical copolymerization of components a 1 ), a 2 ) and b) in the aqueous phase.
14. The method according to claim 13 , applied in service water or wastewater systems, in cooling loops, in seawater desalination plants, in reverse osmosis systems, and for conditioning of brackish water and in the recovery of sugar from sugar beet.
15. The method according to claim 14 , applied in the recovery of sugar from sugar beet for treatment of aqueous suspensions containing chopped sugar beet.
16. The method according to claim 13 , wherein the copolymer is added to the water-conveying system in a proportion of 0.1 to 5000 ppm.
17. The method according to claim 16 , wherein the copolymer is added to the water-conveying system in a proportion of 1 to 100 ppm.
18. A method for grinding and dispersing of pigments, comprising:
grinding and dispersing pigments in the presence of an auxiliary agent comprising the copolymer of claim 1 .
19. A textile-treatment and leather-treatment process, comprising:
treating a textile or leather with the copolymer of claim 1 .
20. A cleaning-agent or washing-agent formulation, comprising:
the copolymer of claim 1 as an auxiliary agent.