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Applications of Methylethylketoxime (MEKO)

Example 1. MEKO-end-capped PU Coating

1) Preparation of MEKO-end-capped PU prepolymer solution

Formulation:

Parts(w/w)
a. α,α,α',α'-Tetramethyl Xylylene Diisocyanate
259
b. Carbitol Acetate
400
c. Trimethylolpropane
28
d. Polybutanol
212
e. Dibutyltin Dilaurate
0.1
f. MEKO
101

Add ingredients a,b, c,d and e into a reactor fitted with a stirrer, heater, thermometer and gas inlet. Heat to 80~100C while stirring under nitrogen and keep for 3hr to allow max. PU prepolymer yield, that is NCO% reaches 8.9﹪. Add MEKO (ingredient f) into the solution and react at 60~80C for 3hr until NCO peaks disappear by IR detection. Thus MEKO end-capped PU prepolymer solution, with 60% of solid content, is obtained.

2) Preparation of the coating

Formulation:

  MEKO end-capped PU prepolymer solution
100
h. Carbon Black
1
i. Titanium Dioxide
5
j. Calcium Carbonate
80
k. Aromatic Naphtha (bp. 100~200C)
30

Place the above ingredients in a mixer, and mix thoroughly to achieve a uniform suspension.

Characteristics and Use:
• High adhesion, impact resistance and storage stability.
• Suitable for galvanized steel surface, automotive, etc.
• Recommended to apply by air spray; bake at 120C for 15min; film thickness 20μm. It can also be applied by brush, roller, blade and E-coating.


Example 2. Waterborne Exterior Coating

Formulation:

Water
8.33
Soy Lecithin Emulsion (Centromix LP-1421)
9.0
Linaqua
8.10
Titanium Dioxide
34.99
Al powder or Zinc Oxide 427W
46.7
Linseed Oil
22.46
Talc
23.75
Phenyl Alkylsulfonate
21.65
Water
8.33
Linaqua
8.10
SynvarexlA-5-97
7.7
6﹪ Cobalt Caprylate
7.4
6﹪ Magnesium Naphthenate
7.97
24﹪ Cobalt Naphthenate
9.7
8﹪ Zinc Naphthenate
8.00
MEKO
7.65
Water
8.33

Disperse Centromix LP-1421 in water. Add Linaqua slowly while stirring. Then add the next 5 ingredients in sequence as listed above. Mill the resulting solution to 4 Hegman (50.00 um). Add the remaining ingredients in sequence and stir thoroughly.

Characteristics and Use:
• Exterior masonry coating with glaze finish.
• Excellent weather resistance.

Example 3. Solventborne Interior Coatng

Formulation 1: Low-gloss white alkyd coating

Titanium Dioxide OR-540
34.15
Calcium Carbonate
22.57
Zinc Oxide (Kaclox 515)
46.70
5﹪ Calcium Naphthenate
7.90
Beckosol P-470-60 Alkyd Resin
7.73
Solvent Oil (bp. 150~200C)
6.53
Levelling Agent
7.15
Solvent Oil (bp. 150~200C)
6.52
6﹪ Colbalt Naphthenate
8.16
MEKO
7.65

Place the first 6 ingredients in a colloid mill and reduce the particle size to 6 Hegman (25.00um). Add the remaining ingredients in sequence while stirring and mix thoroughly.

Characteristics and Use:
• Interior wood and concrete coating.
• High wear resistance.

Formulation 2: White glossy lacquer

Titanium Dioxide R-750
34.15
Zinc Oxide Kadox515
46.70
4﹪ Calcium Naphthenate
7.85
Thixcin
8.51
Backosol P-470-70 Alkyd Resin
7.86
Solvent Oil (bp. 150~200C)
6.52
Backosol P-470-70 Alkyd Resin
7.86
Solvent Oil
6.52
6﹪ Colbalt Naphthenate
7.95
Violet Dispersing Agent
8.50
MEKO
7.65

Place the first 6 ingredients in a colloid mill and reduce the particle size to 6 Hegman (25.00um). Add the remaining ingredients in sequence while stirring and mix thoroughly.

Characteristics and Use:
• Hard surface coating.
• High wear and aging resistance.

Example 4. White Chlorinated Rubber/Alkyd Lacquer

Formulation:

 
I
II

Parts (w/w)
Parts (w/w)

5~20mpa.S Chlorinated Rubber

Medium-oil Soy Alkyd (70%)

Long-oil Linseed Alkyd (70﹪)

Titanium Dioxide (Rutile)

Cobalt Naphthenate

Lead Naphthenate

MEKO

Petroleum Solvent

Aromatic Solvent

8.5

30.4

18.4

0. 2

0. 4

0. 1

8.0

34.0

8.9

27.0

19.40

0. 2

0. 4

0. 1

11.0

33.0

Total
100
100

Example 5. Chlorinated Rubber Road Paint

Formulation:

I
II
III
Parts (w/w)
Parts (w/w)
Parts (w/w)

20mpa.s Chlorinated Rubber

Long-oil Alkyd (60﹪)

Chlorinated Paraffin (70﹪)

Chlorinated Paraffin (42﹪)

Titanium Dioxide (Rutile)

Zinc Oxide

Blanc Fix

Talc

Calcium Carbonate Heavy

Modified Bentonite

Epichlorohydrin

Cobalt Naphthenate

Lead Naphthenate

Butanone

Toluene

Ethyl Acetate

MEKO

8.6

6.6

-

6.4

17.1

4.3

-

12.0

10.8

0. 5

0. 3

0.1

0.2

29.8

-

3.0

0.3

6.1

16.5

-

-

17.6

-

14.0

14.1

-

0.5

0.2

0.2

0.4

-

30.1

-

0.3

6.5

14.0

-

-

9.6

-

19.2

9.6

9.6

0.5

0.5

0.1

0.2

-

20.7

-

0.3

Total
100
100
100

Example 6. Alkyd Lacquer

Formulation (parts w/w):

 
Black
Red
Green
Light Grey
Sky Blue
White

Alkyd (50%)

Carbon Black (Hard)

Titanium Dioxide (Rutile)

Lemon Yellow

Iron Blue

Carbon Black (Soft)

Toluidine Red

French Blue

Medium Chrome Yellow

Lead Oxide

Lead Naphthenate (12%)

Cobalt Naphthenate (3%)

Manganese Naphthenate (3%)

Zinc Naphthenate (3%)

Calcium Naphthenate (2%)

Silicone Oil (1%)

MEKO(50%)

Xylene

88.3

2.00

-

-

-

-

-

-

0.08

1.20

1.2

0.60

0.78

0.85

-

0.41

79.8

-

-

-

-

-

8.00

-

-

0.1

1.5

0.30

0.60

0.80

0.90

-

0.41

72.3

-

-

11.40

2.40

-

-

-

1.9

0.07

1.40

0.40

0.40

1.10

0.82

0.40

0.41

70.00

-

19.20

0.39

0.20

0.25

-

-

-

0.07

2.00

0.20

0.80

0.94

1.24

0.40

0.41

70.25

-

18.80

-

1.20

-

-

-

-

0.06

2.00

0.60

0.60

0.80

1.20

0.40

0.41

66.40

-

25.40

-

-

-

-

0.18

-

0.07

2.00

0.80

0.20

0.80

1.20

-

0.41

PVC, %
2.69
12.4
9.2
15.9
14.4
16.4
 
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