Polyurethane foaming material and preparation method thereof

Abstract

The invention discloses a polyurethane foaming material and a preparation method thereof. The polyurethane foaming material is prepared by taking 10-90 parts by mass of thermoplastic polyurethane elastomers as a framework material, reacting with 10-90 parts by mass of isocyanate-terminated polyurethane, water, a catalyst and a selectively added functional additive for foaming, and preparing by anextrusion method, wherein the mass ratio of water to isocyanate-terminated polyurethane is 0.1%-10%; the mass ratio of the catalyst to isocyanate-terminated polyurethane is 0.1%-3%; the mass ratio ofthe functional additive to the polyurethane foaming material is 0-10%; and the content of isocyanate radicals in the isocyanate-terminated polyurethane is 1wt%-25wt%. The polyurethane foaming materialhas the characteristics of simple production process, low density, high / low temperature resistance, extremely low VOC, extremely low compression deformation and the like, and has good application prospects in the fields of sealing, shock absorption, weight reduction, shoe materials and the like.

Description

technical field [0001] The invention relates to the technical field of polymer foaming materials, in particular to a polyurethane foaming material and a preparation method thereof. Background technique [0002] The polyurethane foam material is based on polyurethane, and a large number of bubbles are formed inside the polyurethane matrix by physical or chemical methods, thereby forming a cell structure. It is precisely because of the unique cell structure of the foam material that it has many excellent properties, such as low density, heat insulation, shock absorption, cushioning and sound absorption, so it is used in daily necessities, shoe materials, sporting goods, packaging, It has been widely used in construction, military industry, aerospace industry, transportation industry and automobile industry. [0003] Currently commonly used polyurethane foam materials include polyurethane rigid and flexible foam materials and thermoplastic polyurethane foam materials. The dir...

AI Technical Summary

Problems solved by technology

The direct use of polyisocyanate raw materials in the foaming of traditional polyurethane soft and rigid foam materials is likely to cause residual isocyanate in the material, which is harmful to the human body

Polyurethane rigid foam materials are mainly used in the fields of heat insulation and sound insulation, and cannot be used in the field of shock absorption and buffering

At present, the environment-friendly flexible polyurethane foam is usually the reaction of isocyanate prepolymer, optional polymer polyol and water to mix evenly through mixing equipment, and then poured into the mold for molding and foaming. This process cannot be continuously produced and the production efficiency is low. , In addition, this polyurethane flexible foam production process cannot continuously produce sheets and membranes

[0004] Thermoplastic polyurethane foaming materials are prepared by extrusion foaming or autoclave immersion foaming using thermoplastic polyurethane as a matrix using physical foaming agents (such as Chinese patent documents CN110549582A, CN108503879A, etc.), such as the current It mainly refers to steam moldable thermoplastic polyurethane foam particles and thermoplastic polyurethane foam materials prepared by direct extrusion foaming, but it currently has the following problems: on the one hand, steam molding equipment is expensive, and the particles After entering the mold, there is a large gap between the particles, which is easy to produce a high defective rate, and the material production cost is high; The thermoplastic polyurethane foam material, because thermoplastic polyurethane is an elastic stretch material, the compression deformation of the thermoplastic polyurethane foam material is relatively large, which also limits its wider application

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