High-strength and high-toughness polyurethane material, as well as preparation method and use thereof

Abstract

The invention discloses a high-strength and high-toughness polyurethane material and a preparation method thereof. The high-strength and high-toughness polyurethane material is prepared by the reaction of the following raw materials: an A component, a B component and a C component, wherein the A component comprises a polyurethane prepolymer and one or two or more of polymethylene polyphenyl isocyanate and diisocyanate derivatives; the B component comprises a small-molecular chain extender and one or two or more of high polymer polyols and high polymer polyamines; and the C component comprises a catalyst and an antioxidant, as well as one or two or more of optional components, namely a dewatering agent, a defoaming agent, a plasticizer and an anti-hydrolysis agent. The prepared polyurethane material has special high strength and good toughness, and can withstand high-strength impact and prevent fracture; and furthermore, the bending strength can achieve 75-95MPa, the bending modulus can achieve 1900-2950MPa, and the impact strength can achieve 60-95KJ / m<2>.

Description

technical field [0001] The invention relates to a polyurethane polymer material, in particular to a high-strength and high-toughness polyurethane material, as well as its preparation method and application. Background technique [0002] As a polymer material, polyurethane can be used to prepare various products with a wide range of hardness. Usually, the hardness range of its products covers Shore hardness from Shore A 20 to Shore D 70. However, with the further expansion of the application field of polyurethane, users have also put forward new requirements for polyurethane materials in the actual application process. For example, the characteristics of low-viscosity polyurethane that can be directly poured to prepare products can be applied to materials that require high strength. In the field, the hardness of the material will usually exceed Shore D 70 at this time. And such a hardness range is the hardness range of traditional thermoplastics, such as polystyrene, nylon, ...

AI Technical Summary

Problems solved by technology

The preparation method of this patent includes two steps, and the process is relatively complicated; at the same time, its curing is realized by the reaction of double bonds, which is different from the simple curing method commonly used for polyurethane materials

[0010] The existing polyurethane materials have relatively obvious defects. The improvement of strength is achieved by compounding with glass fiber, compounding with epoxy resin, and forming a urea structure with blocked amine. The operation steps are complicated, and different materials need to be considered during the compounding process. The problem of compatibility needs to solve the problem of interfacial adhesion during the compounding process, and the problem of product foaming caused by the moisture introduced by the compounded material needs to be considered; it mainly solves the problem of unilateral performance of the material, such as high strength, high temperature resistance, and easy pouring Molding, etc., there is no requirement for the comprehensive properties of the material, such as maintaining the high toughness unique to polyurethane materials under high strength

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