Paint, in particular for temporary road markings, containing biodegradable polymers
The invention relates to removable temporary paint having a release agent including a non-ionic surfactant and having a pH of 3 to 6. The paint includes: 10 wt % to 50 wt % of a natural alkyd resin in an aqueous emulsion, the alkyd resin having a molar mass Mp of 3,000 g/mol to 100,000 g/mol, a polydispersity index lp of 1 to 20, an oil length of 20% to 40%, and an acid index of 10 to 35; at least one inorganic filler and/or pigment; and a sufficient amount of water. The paint can be used as eco-friendly road paint for temporary markings.
1. A temporary paint that is detachable with a detachment agent, said paint comprising:
10 to 50% by mass of an alkyd resin of natural origin in an aqueous emulsion, wherein said alkyd resin has a molar mass of from 3000 g/mol to 100,000 g/mol, a polydispersity index of from 1 to 20, an oil length of from 20 to 40%, and an acid index of from 18 to 35;
at least one of a mineral filler and a pigment; and
water;
wherein said detachment agent is a non-ionic surfactant having a pH of from 3 to 6.
2. The paint according to claim 1 , wherein the acid index is from 18 to 30.
3. The paint according to claim 1 , wherein organic constituents of the paint are present in an amount of at least 97% by mass of natural origin.
4. The paint according to claim 1 , wherein organic constituents of the paint are present in an amount of at least 98% by mass of natural origin.
5. The paint according to claim 1 , wherein the at least one of a mineral filler and a pigment is present in an amount of from 20% to 60% by mass.
6. The paint according to claim 1 , further comprising:
0.1 to 1.5% by mass of an animal protein; and
0.1 to 0.2% by mass of caustic soda.
7. The paint according to claim 6 , wherein the animal protein is casein.
8. The paint according to claim 1 , wherein the at least one of a mineral filler and pigment is selected from the group consisting of calcium carbonate, kaolin, silica, corundum, iron oxide III, and titanium dioxide.
9. The paint according to claim 1 , further comprising at least one member selected from the group consisting of:
0.1 to 1% by mass of a wetting agent;
0.1 to 1% by mass of a thickening agent;
0.1 to 1% by mass of a biocidal agent; and
0.1 to 1% by mass of a drying agent.
10. The paint according to claim 9 , wherein the wetting agent is sodium polyphosphate.
11. The paint according to claim 9 , wherein the thickening agent is cellulose ether.
12. The paint according to claim 9 , wherein the biocidal agent is of plant origin.
13. The paint according to claim 9 , wherein the drying agent is an organometallic iron salt.
14. The paint according to claim 1 , wherein said paint does not release more than 5 g/liter of volatile organic compounds under test conditions of ISO standard 11890-2:2006.
15. The paint according to claim 1 , wherein said paint does not release more than 2 g/liter of volatile organic compounds under test conditions of ISO standard 11890-2:2006.
16. Process for forming a coating that is detachable with a detachment agent that includes a nonionic surfactant and that has a pH of between 3 and 6, said process being characterized in that a paint according to claim 1 is applied on a surface, which paint forms a coating after drying.