Material of polyethylene in super high molecular weight for obstruction guard of highway, and fabricating method

Abstract

An anticollision protecting fence material for highway is prepared from ultrahigh molecular weight polyethene (UHMWPE) through pre-swelling, dissolving and pugging in dual-screw extruder, extruding out for shaping, and stretching for strengthening. It has high longitudinal tension strength (100-180 MPa) and large longitudinal elongation rate at break (50-350%).

Description

technical field [0001] The invention relates to the technical field of road guardrails, in particular to an anti-collision road guardrail material and a manufacturing method thereof. Background technique [0002] The guardrails installed on both sides of the roadbed and the central isolation belt have the protective effect of preventing high-speed vehicles that deviate from the normal direction of travel from rushing out of the road, reducing impact damage to vehicles and occupants, and redirecting vehicles that deviate from the road direction. [0003] Modern high-speed road guardrails have two relatively contradictory requirements. One is that the guardrail material has a sufficiently high tensile strength in the longitudinal or road direction and relatively small deformation to prevent the vehicle from deviating too much from the normal track; When the guardrail material hits, the guardrail material can undergo relatively large elastic-plastic deformation to absorb the im...

AI Technical Summary

Problems solved by technology

Although the continuous production of pure UHMWPE products has been realized by adopting the improved screw and barrel structure, the production speed and the apparent quality of the products are still problems due to the low critical shear rate of pure UHMWPE.

[0014] In order to improve the processing problems and production efficiency of UHMWPE, Tsinghua University, Institute of Chemistry, Chinese Academy of Sciences, Shanghai Research Institute of Chemical Industry, Beijing Dongfang Chemical Factory and other units have also done a lot of significant improvement work on the blending and modification formula of UHMWPE materials, such as the Chinese patent Application 98100960 reported the use of liquid crystal polymers and UHMWPE blending modification, which improved the disadvantage of poor fluidity of UHMWPE melt alone; but the cost of liquid crystal polymer materials is too high, and there is pressure on the economy

[0015] Chinese patent application 01100016 reports that the blending modification of layered silicate and UHMWPE can be improved, although the processing characteristics of UHMWPE can be improved, and the cost of modified additives is also advantageous, but it is difficult to achieve microscopic mixing at the molecular level. The product is prone to stress concentration, and compared with pure UHMWPE, the toughness of the product decreases

[0025] Highway guardrail products manufactured based on existing materials and technologies have disadvantages such as low safety, heavy installation, inconvenient installation, and high production cost, while UHMWPE has not been reported for the manufacture of highway guardrail structural materials.