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Preparation of Polyaspartic Acid Ester Elastic Coatings and Selection of Curing Agents
Wenzhang Lv
Shenzhen Feiyang Protech Corp., Ltd
Polyaspartic acid ester is an aliphatic compound with paramido group.
Compared with general hydroxyl resin and epoxy resin, the drying speed is better.
The molecular weight of polyaspartic acid ester is small and its dicyclohexyl structure makes the
coating made of aspartic acid ester has higher hardness than that of common resin.
In addition, the high density ester bond on the branched chain of polyaspartic acid ester also provides a
strong polar group for the macromolecular chain, which makes the polymer products have a strong
cohesion, which is manifested in the outstanding mechanical strength of the polyaspartic acid ester coating.
Aspartic acid ester is combined with elastic polyurethane isocyanate to enhance the softness, wear
resistance and adhesion of the coating. Aspartic acid ester resin can be widely used in waterproofing,
floor and other fields.
Figure 1: Aspartate Resin Structure
Polyurethane isocyanate is usually composed of polyester polyol, polyether polyol, polycarbonate
polyol, etc which were used as soft segment. Diphenylmethane diisocyanate (MDI), toluene
diisocyanate (TDI), hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI) were used as
hard segment synthesis.
Figure 2: Structure Diagram of Polyurethane Isocyanate
In this paper, polyaspartic ester was used as the main resin and various polyurethane isocyanates were
used as curing agents. The mechanical properties of the film were tested after the preparation of the
film.
1. Test part
1.1 Experimental raw material
F420
F420(Shenzhen Feiyang Protech Corp., Ltd) polyaspartic acid ester resin;
GB190 (Shenzhen Feiyang Protech Corp., Ltd) modified prepolymer based on IPDI and polyester polyol;
GB805B-100(Shenzhen Feiyang Protech Corp., Ltd) modified prepolymer based on TDI and polyether polyol;
GB925-85(Shenzhen Feiyang Protech Corp., Ltd) modified prepolymer based on IPDI and polyester polyol;
GB926-90(Shenzhen Feiyang Protech Corp., Ltd) modified prepolymer based on IPDI and polyester polyol;
GB927-80(Shenzhen Feiyang Protech Corp., Ltd) modified prepolymer based on IPDI and polycarbonate polyol;
SP103P (Shenzhen Feiyang Protech Corp., Ltd) modified prepolymer based on IPDI and polyester polyol;
GB2863 (Shenzhen Feiyang Protech Corp., Ltd) modification of prepolymer based on HDI and polyester polyol
GB906-80 (Shenzhen Feiyang Protech Corp., Ltd) modified ternary prepolymer based on IPDI and polyester polyol.
1.2.Test Method
1.2.1 Mechanical property test
| GB190 | GB925-85 | SP103P | GB805B-100 | GB927-80 | GB926-90 | GB2863 | GB906-80 | |
| Performed Polymer NCO% | 7.20% | 7% | 6% | 10% | 7.70% | 6.40% | 11.0% | 6.80% |
| Prepolymer Viscosity(mpas/25℃) | 2500 | 6500 | 300 | 4500 | 6500 | 6000 | 3500 | 3500 |
| Prepolymer Solid Content(%/105℃,2h) | 90 | 90 | 65 | 100 | 80 | 90 | 100 | 80 |
| Elongation(%) | 427 | 470 | 406 | 380 | 237 | 460 | 300 | 230 |
| Tensile Strength (MPa) | 24.26 | 34 | 25 | 25 | 25 | 26 | 12 | 23 |
| Tear(ing) Strength(MPa) | 51 | 80 | 57 | 90 | 100 | 70 | 55 | 80 |
| Elastic Restitution | 80 | 24 | 72 | -22.4 | -80 | -60 | 95 | N/A |
| Rebound Degree (%) | 90.9% | 65% | 87% | 45% | 27% | 72% | 95% | N/A |
| Abrasion750g,500r,CS17wheel(mg) | 25 | 30 | 15 | 20 | 10 | 30 | 10 | 60 |
After the F420 asparagus resin and prepolymer were mixed in a certain proportion, the coating film was coated on the glass plate and the thickness of the paint film was controlled in the range of 300-500 um. After two weeks of drying, the paint film was removed to test the performance.
Table 1: F420 Aspartic Acid Ester and Mechanical Properties of Elastic curing Agent paint Film
1.2.2 Weathering test
F420 was prepared into paint and reacted with elastic curing agent. The film was prepared by drying for two weeks and then put into quv (Ultraviolet Aging) tester. Its weather resistance is tested every once in a while.
|
Paint Formula |
|||||||
| Material Name | Weight(g) | ||||||
| F420 | 48.5 | ||||||
| R595 Titanium Pigment | 48.5 | ||||||
| BYK163 Dispersant | 1 | ||||||
| BYK410 Anti-settling Agent | 0.1 | ||||||
| Efka-2722 No Foam | 0.3 | ||||||
| Efka-3600 Flatting Agent | 0.1 | ||||||
| Uv-1130 Ultraviolet Absorbent | 1 | ||||||
| Uv-292 Ultraviolet Absorbent | 0.5 | ||||||
|
|
|||||||
| Test Curing Agent | GB190 | GB805B-100 | GB927-80 | GB2863 | SP103p | ||
| Rate of drying | 4h | 8h | 2h | 1h | 2h | ||
| Potlife | 1.5h | ＞1h | 80min | 30min | ＞1h | ||
| Film Thickness (mm) | 0.3 | 0.34 | 0.32 | 0.33 | 0.29 | ||
| Results of Self-drying at Room Temperature for Two Weeks | |||||||
| Gloss(°) | 83 | 74 | 87 | 80 | 87 | ||
| Tensile Strength (MPa) | 17.12 | 18 | 15.17 | 11.55 | 19 | ||
| Elongation(%) | 370 | 380 | 218 | 284 | 313 | ||
| QUV Results after 9 Days | |||||||
| Gloss(°) | 98 | 12 | 85 | 84 | 85 | ||
| chromatic aberration | △E=1.3 | △E=2.1 | △E=1.1 | △E=1.5 | △E=1.1 | ||
| Tensile Strength (MPa) | 27.08 | 13.38 | 36.18 | 9.59 | 29.96 | ||
| Elongation(%) | 384 | 300 | 215 | 270 | 301 | ||
| QUV Results after 23 Days | |||||||
| Gloss (°) | 53 | 10 | 68 | 84 | 50 | ||
| Chromatic Aberration | △E=1.5 | △E=4.5 | △E=1.6 | △E=2 | △E=1.7 | ||
| Tensile Strength (MPa) | 27.18 | 9 | 40 | 11.4 | 35 | ||
| Elongation (%) | 363 | 210 | 217 | 314 | 274 | ||
Table 2: F420 aspartic acid ester and elastic curing agent film weather resistance table.
Conclusions
It can be seen from table 1 that the mechanical properties of different curing agents and F420
polyaspartic acid ester are very different.
GB190,G925-85 and GB926-90 hve good elongation, GB925-85 and GB 926-90 have good tensile strength.
GB190, GB2863 and GB805B-100 have low viscosity and high solid content.
From table 2, we can see that GB805B-100 modified by TDI and polyether polyol has poor weathering
resistance, After 9 days of storage, the gloss and mechanical properties of the paint film decreased
obviously.
The mechanical properties of IPDI modified polyester lactone, polycarbonate, polyester polyol curing
agent GB190 / GB927-80 / SP103P had little change after 23 days, but the gloss was decreased.
The gloss and mechanical properties of polyester polyol curing agent GB2863 based on HDI
modification are basically unchanged.
To sum up, the film prepared by high solid content, low viscosity elastic curing agent and F420
polyaspartic acid ester resin has excellent mechanical properties.
The mechanical properties and weathering resistance of the coatings prepared with different prepolymer
and F420 polyaspartic acid ester resin were different.
These properties enable polyaspartic acid ester coatings to meet the requirements of waterproofing,
floor and other fields.
Solvent-free polyaspartic acid ester resin combined with high solid and low viscosity elastic curing agent
has the advantages of low VOC emission, eco-friendly, superior performance and no need of multi-
channel construction, which is the direction of the development of coatings industry in the future.
Reference Documentation
[1]
Weibo Huang,Ping Lv,Eco-friendly material-- Technical principle of spray Polyurea[J].Housing material and its Application,2000,(2):22-26
[2]
Peili Liu,Guangye Liu, Weibo Huang.Preparation and study of polyaspartic acid ester polyurea [J]. Polyurethane Industry, 2005 / 20 (4): 16-19
[3]
Weibo Huang,Baozhu Wang,Peili Liu etc. Recent Progress in spray Polyurea Technology--Polyaspartic acid ester polyurea. Shanghai Coatings 2005 43 (5): 19-22
