Page 54 - 《橡塑技术与装备》英文版2026年1月

HINA R&P TECHNOLOGY AND EQUIPMENT

results showed that at an impact velocity of 18 m/ and consumption reduction, as well as improved
s, the coating structure on the back-facing surface protective effects. It is necessary to consider the
exhibited the strongest impact resistance against a impact strength and rigidity in humid environments,
flat-headed impact rod. The composite panels with while also resisting collisions and scratches from
polyurea as the interlayer exhibited superior impact sharp objects to prevent the battery from violently
resistance mechanical properties compared to those igniting due to external forces. These requirements
with polyurea as the coating layer. can be met by adjusting the supporting polyurea
In modern naval warfare, ships and submarines coating, which possesses complex mechanical
are subject to explosion and impact damage. Yu Xia properties such as waterproofing, impact resistance,
compounded fibers with negative Poisson's ratio and super-viscoelasticity, and hysteresis characteristics.
polyurea to obtain a polyester-carbon fiber/polyurea More ove r, pol yure a c oat i ngs a re sui t abl e for
composite material with combined properties. The continuous production, saving a significant amount
research results show that: of energy and space.
（1）As the winding angle decreases and the Yao Xuemin et al. studied the protective effect
diameter ratio increases, the fracture energy of of a polyurea topcoat combined with an epoxy zinc-
the material increases. The winding angle of 5°, rich primer on automobile chassis. When the coating
diameter ratio of 9:1, and epoxy coating constitute thickness was 40μm, the salt spray resistance and
the optimal combination parameters for mechanical aging resistance reached 1,000 hours.
properties and deformation, with the fracture energy Wang Nan and colleagues prepared a protective
increased by 1.6 times, 1.4 times, and 1.1 times, c oa t i ng for new e ne rgy vehi c l e c ha ssi s usi ng
respectively. silica, titanium dioxide, single-layer graphene,
（2）The composite material with the optimal and polyaspartic ester polyurea. The mechanical
combination parameters, featuring double-layer properties, weather resistance, salt spray resistance,
we a vi ng, e xhi bi t s t he m a xi m um di spl a c e m e nt and stone chip resistance of the protective coating
of 24.93 mm when stretched to cracking, with a were investigated. The results showed that the
maximum strain tolerance of 2.513. Additionally, polyaspartic ester polyurea coating exhibited
its energy dissipation during tensile fracture is 2.65 excellent adhesion, mechanical properties, corrosion
times that of pure polyurea. This is expected to resistance, and stone chip resistance. After adding
provide a reference for the selection of protective silica and titanium dioxide, the corrosion resistance
material systems for naval vessels and the structural and adhesion of the coating improved further after
design of functional protective coatings for naval artificial accelerated aging and neutral salt spray
vessels' explosion and impact resistance. resistance tests, but the tensile strength and tear
2.3 Application of polyurea in the automotive strength decreased. However, the addition of single-
industry layer graphene improved all properties of the
With the intensification of national efforts to coating, especially its stone chip resistance.
combat environmental pollution, VOC emissions Ding Minghui and others adopted nano-modified
have become a stumbling block to the development aliphatic polyurea paint as the top coat for bus
of the automotive industry. Furthermore, the core roofs. The gel time of the paint is more than 25
component of new energy vehicles, the automotive minutes, and the film thickness achieved after one-
p o we r b a t t e r y p a c k , d e m a n d s e x t r e m e l y h i g h time spraying is 80 μm without sagging. The surface
collision protection, which simultaneously requires drying time at room temperature is 10~15 minutes,
the automotive chassis to achieve energy saving which meets the requirements of DI type products

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