Radiation curable polycaprolactone diol as well as preparation method and application thereof

Abstract

The invention relates to radiation curable polycaprolactone diol as well as a preparation method and application thereof. The number-average molecular weight of the radiation curable polycaprolactonediol is 300 to 6000; a structure formula of the radiation curable polycaprolactone diol is shown in the description, wherein the sum of x and y is an integer from 1 to 50. A main chain of the radiation curable polycaprolactone diol provided by the invention contains an unsaturated double-bond; under the heat and radiation conditions, the unsaturated double-bond in the polymer main chain generatescrosslinking so that the mechanical property, the chemical-resistant performance and the dimension stability of the product are improved. In addition, only one unsaturated double-bond is contained inthe polymer main chain, so that the controllable speed in the subsequent heat and radiation curing is ensured. In addition, the double-bond has the controllable crosslinking density; the comprehensivephysical and chemical performances of the product are improved, for example the stretch intensity is higher; the modulus is greater; the solvent-resistant performance is better; the high-temperature-resistant performance is better; the acid value is lower; the anti-yellowing performance is excellent. In addition, the radiation curable polycaprolactone diol provided by the invention has the advantages that the main chain is provided with branch chains, so that the crystallization temperature is reduced; the use is more convenient.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a radiation-curable polycaprolactone diol and its preparation method and application. Background technique [0002] Polycaprolactone diol is widely used in polyurethane elastomers, coatings, adhesives and other fields. The elastomer prepared from this raw material has excellent hydrolytic stability and high and low temperature performance. It has more balanced performance than polyether type and ordinary polyether type PU. On the one hand, it can show the excellent tear resistance and stress-strain behavior of ordinary polycaprolactone type PU, and at the same time it shows the outstanding performance of polyether type PU. Excellent compression set and rebound performance, so it has been widely used in the market. Especially in some occasions that have high requirements on the high temperature performance, dynamic performance, wear resistance and flex resistance of th...

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Problems solved by technology

[0003] Generally speaking, the PU products obtained from polycaprolactone diol have good flexibility, and the tensile strength, modulus, solvent resistance, high temperature resistance and many other properties of polyurethane can be greatly improved after moderate crosslinking; In other words, polyurethane can be cross-linked during the molding process by isocyanate and imino groups, hydroxyl-terminated polyurethane prepolymers, or adding polyol cross-linking agents; however, the cross-linking between molecules during molding is subject to reactive groups It is coated and the distance between the groups is large, so the final conversion rate is limited. Therefore, defects in the microstructure of the product will easily lead to a decline in the performance of the product

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