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Synthesis and Properties of Polyurethane Acrylate (PUA)

Release time:

2014-06-23 11:02

Synthesis and Properties of Polyurethane Acrylate (PUA)

Synthesis reaction equation for PUA:

Schematic diagram of the microphase structure of polyurethane:

*The large number of urethane N-H bonds readily forms hydrogen bonds. The long-chain diol units in the molecule provide flexibility, resulting in microdomains of hard segments and soft segments. This microphase separation between soft and hard segments imparts polyurethanes with many unique properties, including excellent flexibility, high shear and tensile strength, and good abrasion resistance.

The relationship between the structure and properties of polyurethane:

Generally speaking, the molecular structure of polyurethane determines the performance of the synthesized PUA.
1. The structure of polyurethane exhibits strong tunability, allowing adjustments in several aspects such as molecular weight, reactivity functionality, flexibility, and modulus.
2. Polyurethane cured products based on polyether glycols exhibit high flexibility; however, the presence of side-chain methyl groups in the polyether will reduce their flexibility.
3. Polyurethane cured films based on polyether glycol exhibit higher tensile strength but reduced flexibility.
4. PUA based on polyether glycol typically has a higher viscosity than polyurethane-based PUA, and the cured coating exhibits better adhesion to polar substrates.

5. The UV polymerization reactivity of PUA with the same functionality is significantly lower than that of epoxy acrylates, and inhibition is severe.
6. Increasing the acrylate functionality of PUA can enhance the photopolymerization rate. While the polymerization activity of trifunctional PUA is comparable to that of difunctional PUA—with no significant improvement—UV curing speed is greatly enhanced for hexafunctional PUA.
7. PUA can serve both as a main resin and as an auxiliary functional resin, imparting an excellent combination of flexibility and hardness to the cured coating, reducing stress-induced shrinkage, and improving adhesion.

8. Designing and modifying the structure of PUA can endow it with corresponding functionalities; therefore, research and development of PUA have become the main focus in UV resin development.

Research and development directions for polyurethane acrylates:

1. High adhesion: To plastics, metals, and vacuum coatings;
2. High hardness and high wear resistance: plastic and metal coatings;
3. Low shrinkage rate: Vacuum-plated primer and topcoat;
4. High and low temperature resistance: Headlight lenses and reflectors for automobiles;
5. High flexibility: Soft substrate varnish or ink;

6. Low viscosity: Reduce the amount of monomer used;
7. High curing rate: Enhance the UV curing rate of PUA.
Introduction to the Performance of Guangzhou Boxing’s Diamine PUA:

Number	Name and Composition	Solid content wt%	Color APHA	Viscosity CPS/30℃	Acid value mg KOH/g
B-205	Aliphatic polyester type	≥98	50Max	35,000–45,000	≤1.0
B-210	Polyether-type aliphatic	≥98	80Max	30,000–40,000	≤2.0
B-221	Aliphatic polyester type	≥97	50Max	13,000–18,000	≤1.0
B-258	Aliphatic polyester type	80 ± 2	80Max	7000-9000	≤1.0
B-265	Aliphatic polyester type	≥97	50Max	10,000–15,000	≤3.0
B-268	Aliphatic polyester type	≥98	80Max	40,000–60,000	≤2.0
B-269	Aliphatic polyester type	≥98	80Max	15,000–25,000	≤1.0
B-270	Aliphatic polyester type	≥96	80Max	1300–1800	≤4.0

B-210: Polyether-based, flexible, yellowing-resistant

B-221: Temperature-resistant, water-resistant, and yellowing-resistant

B-258: Hybrid, with outstanding overall performance

B-265: Polyester-based, weather-resistant, high adhesion

B-268: High molecular weight, low shrinkage, acid and alkali resistant

B-270: Ultra-low viscosity, high flexibility

B-281: Self-curing, high toughness, high fullness

B-289: Self-curing, solvent-resistant, high adhesion

Introduction to the Three-Functional PUA Performance of Guangzhou Boxing:

Number	Name and Composition	Solid content wt%	Color APHA	Viscosity CPS/30℃	Acid value mg KOH/g
B-302	Aliphatic polyether-based PUA containing 15% HDDA	≥98	50Max	5000-7000	≤1.0
B-305	Aliphatic polyether-based PUA containing 15% HDDA	≥97	50Max	1500-2000	≤1.0
B-308	Aliphatic polyether-type PUA containing 15% TPGDA	≥97	50Max	2000-3000	≤1.0
B-320	Aliphatic polyester-based PUA containing 15% HDDA	≥97	80Max	2400-3200	≤2.0
B-321	Aliphatic polyester-based PUA containing 15% TGPDA	≥97	80Max	4800-5800	≤2.0
B-369	Aliphatic polyester-based PUA	≥97	100Max	10,000–15,000	≤4.0

B-305: Polyether-based, diluted with HDDA

B-308: Polyether-based, TPGDA-thinned

B-320: Polyester-based, diluted with HDDA

B-321: Polyester-based, diluted with TPGDA

B-369: Excellent adhesion to plastic substrates

B-381: Self-curing, high toughness, chemical resistance

Introduction to the Performance of Guangzhou Boxing’s Six-Functional and Modified PUA:

Number	Name and Composition	Solid content wt%	Color APHA	Viscosity CPS/30℃	Acid value mg KOH/g
B-618	Aliphatic polyurethane	≥98	50Max	22,000–32,000	≤2.0
B-619	Aliphatic polyurethane	≥98	50Max	1800-2200	≤2.0
B-681	Self-curing polyurethane	≥98	100Max	5,000–8,000	≤2.0
B-6380M	Modified polyurethane acrylate	70 ± 2	50Max	2000-3000	4-6
B-6380NY	Modified polyurethane acrylate	70 ± 2	50Max	900-1300	≤2.0
B-6580	Modified polyurethane acrylate	75 ± 2	50Max	3000-4000	4-5

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