阅读说明：本技术 吹洗涂漆管路的改进方法和水性吹洗清洁剂 (Method for flushing painting lines and aqueous flushing cleaner ) 是由 J·M·卡萨莫尔 M·A·詹弗兰科 J·吉尔博 于 2020-03-19 设计创作，主要内容包括：本发明涉及一种吹洗被非固化漆涂布的涂漆管路的方法,其具有改进的清洁效率和降低的废水中COD(化学需氧量),其中使涂漆管路与包含至少一种二醇醚并另外包含至少一种具有至少7个碳原子的水溶性胺的水性吹洗清洁剂溶液接触。此外,本发明涉及具有改进的清洁效率和降低的VOC(挥发性有机化合物)含量的水性吹洗清洁剂溶液,还涉及用于生产所述吹洗清洁剂溶液的浓缩物。(The invention relates to a method for flushing a painting line coated with a non-curing lacquer, having an improved cleaning efficiency and a reduced COD (chemical oxygen demand) in the waste water, wherein the painting line is contacted with an aqueous flushing detergent solution comprising at least one glycol ether and additionally comprising at least one water-soluble amine having at least 7 carbon atoms. Furthermore, the invention relates to an aqueous purging detergent solution with improved cleaning efficiency and reduced VOC (volatile organic compound) content, and to a concentrate for producing said purging detergent solution.)

1. Method for purging a painted line coated with a non-curing paint, in which the painted line is brought into contact with an aqueous purging cleaner solution comprising at least one glycol ether, characterized in that it additionally comprises at least one water-soluble amine having at least 7 carbon atoms.

2. The process according to claim 1, characterized in that the at least one glycol ether comprises hexylethylene glycol and/or hexyldiethylene glycol, preferably hexyldiethylene glycol.

3. The process according to claim 1 or 2, characterized in that the at least one water-soluble amine comprises at least one amine having 7 to 15, preferably 7 to 12, carbon atoms.

4. Method according to any of the preceding claims, characterized in that the purging detergent solution comprises

a)0.05 to 0.50% (w/w) of at least one water-soluble amine having 7 to 15 carbon atoms, calculated as N-methyldiisopropanolamine,

b)0.3 to 1.0% (w/w) of hexylglycol and

c)0.3 to 1.0% (w/w) hexyldiglycol.

5. The process according to any of the preceding claims, characterized in that the at least one amine comprises at least one amine having a conjugate acid with a pKa of at least 8.0, preferably at least 8.3, more preferably at least 8.6.

6. The method according to any of the preceding claims, characterized in that the at least one amine comprises at least one tertiary amine having at least one hydroxyalkyl group.

7. The process according to claim 6, characterized in that the at least one tertiary amine has from 1 to 3 hydroxyalkyl groups, preferably selected from 2-hydroxyethyl and 2-hydroxypropyl, and from 0 to 2 alkyl groups, preferably selected from linear alkyl groups having from 1 to 8 carbon atoms, with the proviso that the sum of hydroxyalkyl and alkyl groups is 3.

8. The process according to claim 7, characterized in that the at least one amine comprises at least one amine selected from the group consisting of N-methyl diisopropanolamine, N-octyl diethanolamine, triisopropanolamine, and N, N-dibutylethanolamine, preferably from the group consisting of N-methyl diisopropanolamine, triisopropanolamine, and N, N-dibutylethanolamine, more preferably N-methyl diisopropanolamine.

9. Method according to any of the preceding claims, characterized in that the purging detergent solution is free of any surfactant.

10. Method according to any of the preceding claims, characterized in that the purging detergent solution is free of any organic solvent selected from benzyl alcohol and butyl glycol, preferably selected from benzyl alcohol, butyl glycol and butyl diglycol, more preferably selected from benzyl alcohol and glycol ethers having 6 to 10 carbon atoms other than hexyl glycol and hexyl diglycol, most preferably free of any organic solvent other than hexyl glycol and hexyl diglycol.

11. An aqueous purging detergent solution according to any of the preceding claims.

12. Concentrate for the production of an aqueous purging detergent solution according to claim 11, characterized in that the purging detergent solution is obtainable by diluting the concentrate with water, preferably 5:1,000 to 30:1,000 and, if desired, adjusting the pH with at least one acid or base.

13. Concentrate according to claim 12, characterized in that it comprises

a)1 to 40% (w/w) of at least one amine having 7 to 15 carbon atoms, calculated as N-methyldiisopropanolamine,

b)40 to 60% (w/w) of hexylglycol and

c)40 to 60% (w/w) hexyldiglycol.

Examples

Test 1 quantitative 9-drop test on wet paint-5 minutes at RT:

an aqueous lacquer layer having a thickness of between 40 and 60 μm is spread over the glass panel (200X 200 mm). The layer was then partially dried at Room Temperature (RT) for 4 minutes and placed at a slope of 45 °. At a rate of 1 drop per second and a height of from 12 cm, 9 drops of the test purge cleaner solution were added to the panel.

After 5 minutes at room temperature, the width in cm of the spot without paint ("opening") where the drop hit the panel was measured. The larger the width, the better the removal effect of the test solution, i.e., the cleaning efficiency.

Run 2 spray test on wet paint-10 min at RT:

an aqueous lacquer layer with a thickness of approximately 60 μm was stretched over a glass panel (100X 200 mm). The layer was then partially dried at room temperature for 4 minutes and placed at a slope of 45 °. From a distance of 30 cm, 10 ml of the test detergent solution was sprayed onto the panel.

After 10 minutes at room temperature, the removal effect, i.e. the cleaning efficiency, was evaluated according to the following classification: poor (-), regular (+), good (+ +) and excellent (+ +++).

Test 3 quantitative N-drop test on dry paint:

an aqueous lacquer layer having a thickness of between 40 and 60 μm is spread over the glass panel (200X 200 mm). The layer was then dried at Room Temperature (RT) for 24 hours and placed at a slope of 45 °. At a rate of 1 drop per second and a height of from 12 cm, a drop of the subject blasting detergent solution was added to the panel until the layer was opened, i.e. until there were no paint spots where the drop hit the panel.

The number of added drops (n) was measured. The lower the amount, the better the removal effect of the test solution, i.e. the cleaning efficiency.

Purge detergent solution and test results:

for each amine A, B and C (see below), a mixture of 95 wt.% hexyldiglycol and 5 wt.% amine was prepared.

Amine A triethanolamine (6 carbon atoms) (comparative example)

Amine B N-methyl diisopropanolamine (7 carbon atoms) (examples of the invention)

Amine C N, N-dibutylethanolamine (10 carbon atoms) (examples according to the invention)

The mixture was diluted to 2 wt% with deionized water.

A quantitative 9-drop test was carried out on a wet paint "F muller Red" (Hemmelrath, Germany) as described above (test 1).

The results are summarized in the table below, where the cleaning efficiency is calculated in comparison with a triethanolamine (amine a) -containing detergent solution considered as reference.

Amines as pesticides	Width of opening in cm	Cleaning efficiency in%
			A	1.45	100
B	1.51	104
			C	1.48	102

Spray tests were also carried out as described above (test 2) on a wet paint "F muller Red" (Hemmelrath, Germany) and showed the following results:

amines as pesticides	Cleaning efficiency
		A	+
B	+ to +
		C	++

For amines A and B, quantitative N-drop tests were carried out as described above (test 3) on a drying lacquer "F muller Red" (Hemmelrath, Germany). The results are summarized in the table below. Cleaning efficiency was calculated compared to the reference triethanolamine (amine a) containing detergent solution.

Amines as pesticides	Number of drops (n)	Cleaning efficiency in%
			A	20	100
B	9	222

Surprisingly, all tests revealed improved cleaning efficiency of the inventive purge detergent solution containing water soluble amines having at least 7 carbon atoms (amines B and C) compared to the purge detergent solution containing an amine having 6 carbon atoms (amine a).