Preparation of Polyaspartic Acid Ester Elastic Coatings and Selection of Curing Agents

Shenzhen Feiyang Protech Corp., Ltd

Wenzhang Lv

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, poly 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(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 poly 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

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.

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 have 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 poly 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

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