Amine composition and application thereof, polyurethane resin and preparation method and application thereof

Abstract

The invention provides an amine composition which consists of diamine and monoamine in the molar ratio of (1.1-17.1):1. The invention further provides polyurethane resin and a preparation method thereof. The total amine value of the polyurethane resin is 1.20-20.0 mgKOH/g; the primary amine value is 8.7-38.8 percent of the total amine value; the secondary amine value is 5.6-82.6 of the total amine value; and the tertiary amine value is 8.7-55.6 percent of the total amine value. The preparation method comprises the following steps of: mixing high molecular dihydric alcohol with diisocyanate ester; adding a catalyst, and reacting at the temperature of 30-100 DEG C for 2-8 hours to obtain a dibasic alcohol polymer; reacting with a low molecular active hydrogen compound and a low molecular polyhydroxy compound; adding diamine which accounts for 0-70.6 percent of 100 percent by weight of diamine in the amine composition, and expanding a chain in an ester solvent; and adding the rest of diamine in the amine composition and all monoamine, and undergoing chain expansion and chain termination reactions in an ester and/or amine solvent to obtain polyurethane resin. The prepared polyurethane resin has the advantages of high physical and mechanical properties and high-temperature stewing resistance.

Description

technical field [0001] The present invention relates to the polyurethane field, specifically, the present invention relates to a polyurethane resin and its preparation method and use; the present invention also relates to an amine composition and its use. Background technique [0002] The full name of polyurethane (PU) is polyurethane, which is a general term for polymers containing carbamate (-NHCOO-) groups. It is usually composed of isocyanate (containing -NCO groups) or its adducts and active hydrogen-containing (mainly the active hydrogen in the hydroxyl group) polyol reaction. In this type of polymerization reaction, it is often necessary to add a chain extender to react with the isocyanate-terminated prepolymer, resulting in the extension of the molecular chain diffusion and the presentation of a hard segment. In order to obtain high-quality polymer products with uniform molecular weight and stable molecular structure, it is necessary to add a terminator in time to t...

AI Technical Summary

Problems solved by technology

Amine compounds can often be used as chain extenders and / or terminators in polymerization reactions. Commonly used are ethylenediamine, diethylenediamine, triethylenetetramine, etc., which react with isocyanate to form urea groups with high cohesive energy. It can give polyurethane polymers good physical and mechanical properties, but because the polymerization reaction process of preparing polyurethane is very intense and the reaction speed is fast, the production is not easy to control

[0007] Therefore, it is necessary to use a suitable amine composition as a chain extender and / or terminator, which can be used to prepare polyurethane resins, which can overcome the shortcomings of too fast reaction speed and difficult control, and thus obtain amines with specific amine value. The high-quality polyurethane resin not only has good physical and mechanical properties, but also has the advantages of high temperature cooking resistance (cooking at 121-135°C for 30 minutes)

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