Water-dispersed resin and paint for automobile coating
A dispersive, resin-based technology, applied in coatings, polyester coatings, latex paints, etc., can solve the problems of molecular weight limitation, low water resistance of coating films, poor water dispersibility, etc., to overcome the decline of water resistance and poor water dispersibility , Excellent impact resistance effect
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Examples
Embodiment 1
[0011] The first step to synthesize resin A 1 and resin B 1 , and the formulations of the resins are listed in Table 1.
[0012] raw material name
Resin A 1
Resin A 2
Resin B 1
Resin B 2
Neopentyl Glycol Hydroxypivalate
1,4 cyclohexyl dimethanol
Polyether 204
13.5
26.1
55.2
13.6
-
-
27.0
14.3
10.2
11.8
8.8
-
16.1
33.2
122.4
21.6
-
-
43.0
20.1
29.5
20.0
-
40.0
Polyacid
tetrahydrophthalic anhydride
41.9
24.0
32.3
12.1
27.6
22.9
22.0
11.0
83.1
45.7
43.9
-
60.0
27.1
49.0
...
Embodiment 2
[0024] The first step to synthesize resin A 2 and resin B 2
[0025] Resin A in Table 1 is used instead of the formula 2 and resin B 2 Except that all the other synthetic techniques are the same as in Example 1. The obtained resin A 2 The hydroxyl value is 67, the acid value is 41, the number average molecular weight is 2600, and the solid content is 80%; the obtained resin B 2 The hydroxyl value is 65, the acid value is 3, the number average molecular weight is 4370, and the solid content is 80% for later use.
[0026] The second step resin A 2 and resin B 2 Polycondensation
[0027] Remove Resin A 2 281.4 parts, resin B 2 140.7 parts (resin A 2 : Resin B 2 =2:1) to replace the resin A in the second step of Example 1 1 and resin B 1 Except, all the other polycondensation processes are with the second step of embodiment 1. The resulting polycondensate has an acid value of 21, a hydroxyl value of 60, and a number average molecular weight of 4000 for future use. ...
Embodiment 3
[0031] The preparation of embodiment 3 water-based automotive intermediate coatings
[0032]
raw material name
Specification
Dosage
The actual amount
convert to solid
Film-forming substance
Water-dispersed resin of the present invention
(Embodiment 1 or Embodiment 2)
Solid content 40%
100
40(44.97%)
water
distilled or deionized water
22
0
Pigments
Titanium dioxide
Kaolin
DuPont, Type R
Tegoza Corporation, SP-4
1250 mesh
1250 mesh
1250 mesh
20
0.3
8
8
4
40.3(45.31%)
crosslinking agent
amino resin
blocked isocyanate
Cyanoamide 1130, 98% solids
Bayer AG 2016, 40% solids
4.1
10.0
8(9%)
catalyst
...
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