Spraying type castor oil-based polyurethane damping material and preparation method thereof

Abstract

The invention discloses a spraying type castor oil-based polyurethane damping material and a preparation method thereof, and relates to the technical field of high polymer damping materials. The spraying type castor oil-based polyurethane damping material is obtained by reaction polymerization of a component A and a component B according to a mass ratio of 1: 2-3; wherein the component A is prepared from the following raw materials in parts by mass: 400 to 700 parts of castor oil, 200 to 400 parts of a polytetrahydrofuran polyol, 400 to 700 parts of a diisocyanate, 10 to 30 parts of a small molecular chain extender, 10 to 20 parts of a silane coupling agent and 100 to 300 parts of a plasticizer; the component B is prepared from the following raw materials in parts by weight: 200 to 600 parts of amine-terminated polyether, 20 to 50 parts of vulcanizing agent, 200 to 500 parts of a plasticizer, 200 to 600 parts of an inorganic filler, 1 to 5 parts of an antioxidant and 10 to 30 parts ofa rheological additive. The component A is a -NCO-terminated net-shaped high-crosslinking-degree polyurethane prepolymer, can quickly react with -NH2 in the component B, and is high in curing speed and convenient to construct, the obtained damping coating is good in elasticity modulus and tensile strength and excellent in damping performance, and the damping factor can reach 1.1.

Description

technical field [0001] The invention relates to the technical field of polymer damping materials, in particular to a spray-coated castor oil-based polyurethane damping material and a preparation method. Background technique [0002] As a class of environmentally friendly products, damping materials are widely used in vibration and noise reduction in the fields of vehicles, industrial machinery, construction and civil engineering, household appliances, precision instruments and military equipment. Viscoelasticity is an important characteristic of polymer materials. The hysteresis and mechanical loss of polymer materials under the action of alternating force are the fundamental reasons for the damping effect. People refer to the phase angle difference δ that the strain lags behind the stress as the mechanical loss angle, and the mechanical loss tangent tanδ is usually used to represent the size of the internal friction. The mechanical loss is closely related to the damping pe...

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Problems solved by technology

Chinese patent CN103113748B "A Silicone Damping Elastomer for Vehicles" introduces hollow glass microspheres and silica powder to increase the modulus and mixing degree of the elastomer, reduce the product density, and achieve the effect of weight loss, but only Simple resin blending, the strength and damping properties of the elastomer are not good enough

Chinese patent CN109021196A "A Silicone Polyurethane Damping Material and Its Preparation Method" mainly uses enol and methyl propylene oxide to synthesize terminal alkenyl ether alcohol, and then synthesizes it with silicone oil with the same silicon dimethyl structure to obtain diol , and then further synthesized to obtain silicone polyurethane damping material, its main advantage is the same carbon dimethyl structure with high solid content, which increases the friction resistance generated when the chain segment moves, improves the loss factor of the material, and improves the damping performance. However, there are certain by-products in the synthesis process, and the production efficiency needs to be further improved. At the same time, the cross-linking degree and compatibility of polyurethane molecules are not good enough, which limits the further improvement of its damping performance.

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