The guardrail generally refers to the barrier facilities set parallel to the road on both sides of a courtyard, highway, or central separation zone. Its main function is to prevent traffic accidents caused by driver errors or other reasons that lead vehicles to go off the road or cross the central separation zone into the opposite lane, thereby protecting the safety of pedestrians, buildings, drivers, and passengers in vehicles. It also serves to guide the driver's line of sight, increase the sense of driving safety, and beautify the highway environment. Existing
highway guardrail boards are generally made of metal materials coated with reflective materials. The drawbacks of this type of guardrail include high manufacturing costs, susceptibility to corrosion from rain, and the long-term loss of reflective effects due to the coating method of reflective materials.
Currently, there are also plastic guardrails made from materials such as ABS, PC, PS, and PET. The US patent US4222522 studied the
anti-collision guardrail boards made from PS, PP, PE, and their blended materials through extrusion molding. This type of guardrail can prevent corrosion and mechanical abrasion, and its structure is simple, economical, and durable. The US patent US20060102883A1 developed a polyurethane resin guardrail, which uses a multi-layer structure for reinforcement materials, including carbon fiber and Kevlar fiber, with a volume fraction of approximately 40% to 60%. It also explored using vinyl, epoxy resin, polyester, or other polymer materials as the matrix for guardrail materials. Adding ethane can further improve the impact performance of the materials. The above research mainly includes studies on matrix materials, design and optimization of the composition ratio between the matrix and additives, addition and formulation optimization of reflective agents and toughening agents, research on the composite mechanism and characteristics between matrix materials and additives, microstructure and structure of the materials, mechanical performance of the materials, reflective performance, the influence of material composition on mechanical and reflective performance, the influence of microstructure on mechanical and reflective performance, and research on the reflective mechanism and characteristics of the materials. Ultimately, this research has not been able to achieve a composite material that combines good impact strength, bending strength, bending modulus, and tensile strength.
The invention provides a highway anti-collision guardrail board that combines good impact strength, bending strength, bending modulus, tensile strength, and excellent reflective performance.
The high-strength anti-collision reflective highway anti-collision guardrail board includes vertical posts and crossbars connecting the posts. The crossbar consists of a matrix and a reflective strip integrated with the matrix. Both the matrix and the reflective strip are made of ABS resin composite materials, which are formed by one-shot injection molding using a twin-screw injection molding machine. This invention achieves a high-strength anti-collision guardrail with good impact strength, bending strength, bending modulus, and tensile strength while also possessing excellent reflective performance through the reasonable ratio of ABS resin composite materials for both the matrix and the reflective strip formed by one-shot injection molding using a twin-screw injection molding machine.
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