Microcellular polyurethane elastomer and preparation method thereof

Abstract

The invention discloses a microcellular polyurethane elastomer and a preparation method thereof. The elastomer contains two components, i.e., a polyol component and a prepolymer component, wherein the polyol component comprises polyester polyol, a chain extender, a foam stabilizer, water, a catalyst and the like; and the prepolymer component comprises polyester polyol, isocyanate and the like. The polyester polyol in the polyol component is prepared from a mixture of aromatic dibasic acid and aliphatic diacid and a mixture of diethylene glycol and other dihydric alcohols by means of polycondensation reaction. Compared with common microcellular polyester-type elastomers, the prepared elastomer has higher hardness and mechanical properties as well as better abrasive and bending resistances, besides, the flowability of materials is good. The material can be used in the fields like soles, solid tires, buffer blocks and the like. The preparation method is simple and feasible.

Description

technical field [0001] The invention relates to a polyurethane microporous elastomer and a preparation method thereof. Background technique [0002] Polyurethane microcellular elastomer is a material whose performance is between that of elastomer and foam material. Its density is between that of foam and solid core material. The pore size of the cells is 0.1-10 μm. It has the advantages of light weight, good impact resistance, energy absorption, good cushioning performance, high strength of elastomer, and good wear resistance. Therefore, in terms of main physical and mechanical properties, polyurethane microcellular elastomers surpass all other microcellular elastomers with the same density, and are widely used in shock-absorbing materials, sealing, shoemaking, solid tires, filtration, etc. Polyurethane microcellular elastomers can be divided into two types: polyether-type and polyester-type. Polyester-type polyurethane microcellular elastomers have good mechanical properti...

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Problems solved by technology

When the product density is 0.32g / cm 3 , the hardness is 32A, the tensile strength is 3.2MPa, and the tear strength is 14N / mm; "Synthesis of polymer polyester polyol and its application in shoe soles" [C]. The thirteenth meeting of China Polyurethane Industry Association Proceedings of the Annual Conference. 2006, 167~171 Li Chunlan, Zhang Qianhe and others prepared a high hardness and high strength polyurethane microporous material for shoe soles by adding polymer polyester polyol, with a density of 0.38g / cm 3 , the hardness reaches 71A, the tensile strength is 5.75MPa, the tear strength is 16.1N / mm, and the elongation is 320%. With the addition of polymer polyester polyol, the hardness and strength of the elastomer increase. , but the elongation rate drops significantly, and it also brings about the increase of the viscosity of the polyol component, the mismatch of the viscosity of the two components, and the problem of affecting the stability of the product

[0004] The molecular structure of aromatic polyester has a benzene ring structure, and the hardness and strength of low-density microcellular elastomers can be improved by using aromatic polyester polyols. However, microcellular elastomers prepared by using aromatic polyester polyols alone have Low temperature stiffness, slow rebound and other issues

CN101486788A discloses a polyurethane microporous elastomer and its preparation method. This patent uses aromatic polyester polyol in the prepolymer component, and adds polymer modified polyester polyol to the polyol component to improve the low density. The hardness of the elastomer improves the appearance of the product, but due to the high viscosity of the aromatic polyester polyol, the fluidity of the mixture and the mutual solubility between the components become poor

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