Polyurethane self-skinning foam as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of polyurethane preparation, and particularly relates to polyurethane self-skinning foam as well as a preparation method and application thereof. The self-skinning foam is prepared from the following raw materials: a polyether-polysiloxane copolymer, amino polyether polyol, polyurea polymer polyol, water and carbodiimide modified isocyanate, the number-average molecular weight of the polyether-polysiloxane copolymer is 1500-6000, the primary hydroxyl group end-capped and EO end-capped rate is at least 85%, and the siloxane chain segment content is at least 50 wt%; the pH value of the amino polyether polyol is 8-10, and the number-average molecular weight of the amino polyether polyol is 300-700. According to the invention, through synergistic cooperation of the substances, on the premise of ensuring that the physical and mechanical properties of the self-skinning foam are the same as those in the prior art, catalysts such as organic amine or tin and the like and foam stabilizers do not need to be added, and generation of VOC and pungent smell is reduced; the polyurethane self-skinning foam disclosed by the invention has the properties of better flame retardance, waterproofness, wear resistance, graffiti resistance, scratch resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of polyurethane preparation, and in particular relates to a polyurethane self-skin foam and a preparation method and application thereof. Background technique [0002] Polyurethane self-skin foam, also known as whole skin foam, is a product with a certain thickness (0.3-3.0mm) of a dense skin layer and a foam inner core made by a molding process, and the cross-sectional density gradually increases from the skin to the inner core. Reduced, showing the shape of an inverse parabola, the skin layer has a density similar to the polymer matrix material 900-1200kg / m 3 , the lowest density at the center is close to tens to hundreds of kg / m 3 . The skin layer has both aesthetic appearance and mechanical properties comparable to olefin plastic leather. [0003] The preparation process and principle of polyurethane self-skin foam is: the inert low-boiling physical foaming agent contained in the mixture is vaporized ...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the need to add catalysts such as organic amines and foam stabilizers on the basis of ensuring its physical and mechanical properties when preparing polyurethane self-skin foams in the prior art, resulting in a large amount of VOC Defects such as and irritating smell, and, the flame retardancy of polyurethane self-skinning foam and the abrasion resistance of outer layer, hydrolysis resistance need to be further improved; Thereby provide a kind of polyurethane self-skinning foam and its preparation method and application

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