High-hardness epoxy-modified polyurethane composite material and preparation method thereof

Abstract

The invention relates to a high-hardness epoxy modified polyurethane composite material, which is prepared by adding a component A and a component B into a vacuumable sealed container and carrying out a mixed reaction by using a prepolymer method, wherein the component A is a mixture of a terminal isocyanate prepolymer and an epoxy resin, and the component B is a mixture of a chain extender and a catalyst. The preparation method comprises: weighing 130-140 parts of the component A and 2.4-15.2 parts of the component B, respectively pre-heating, adding the pre-heated components A and B to a vacuumable sealed container, mixing, carrying out vacuum deaeration while stirring, taking out after the gas bubbles are completely removed, pouring into a corresponding mold, carrying out low temperature curing, demolding, and carrying out heating vulcanization to prepare the high-hardness epoxy modified polyurethane composite material. According to the present invention, the product has advantages of high toughness, prolonged service life in the kettle, controllable reaction speed, low cost, and the like.

Description

Technical field [0001] The invention belongs to the technical field of organic polymer elastic materials and their preparation, and in particular relates to a modified polyurethane composite material and a preparation method thereof. Background technique [0002] Polyurethane elastomer with high hardness (ShoreD hardness ≥70) is widely used in pressure rollers, bearings, gears, stamping dies, bowling balls, etc. However, due to the high hardness value of the polyurethane elastomer material and the high content of hard segments, it exists in both process and material properties. technical challenge. In the preparation of polyurethane elastomer materials, the hardness of the elastomer is mainly increased by increasing the hard segment content. For the prepolymer method, increasing the content of the hard segment means increasing the amount of isocyanate and chain extender. Generally speaking, as the amount of isocyanate and chain extender increases, the hardness of the polyurethan...

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Problems solved by technology

[0007] Judging from the prior art disclosed above, there are the following main defects: 1) the hardness values ​​of the existing modified polyurethane materials are all less than Shao 50D, which cannot meet the requirements of specific applications; 2) the existing formula or process adopted Among them, after the addition of epoxy resin modification, the hardness value of the polyurethane material is not significantly improved; 3) Most of the epoxy resin ring-opening reaction curing agents and catalysts in the prior art tend to use amine curing agents to participate in the process. Epoxy ring-opening reaction, most of the curing reaction uses a diamine (MOCA) chain extender to undergo a ring-opening reaction with the epoxy resin to form an amine-terminated epoxy resin, and then participates with the polyurethane prepolymer Reaction, when using this technical solution to prepare high-hardness materials, due to the high reactivity of the amine group, problems such as fast reaction speed and poor manufacturability will occur, and it is also not suitable for pouring larger products; 4) Some technical solutions do not add Corresponding chain extender components, which will lead to serious shortage of material toughness

[0008] It can be seen from the above that the existing epoxy-modified polyurethane elastomer materials not only have low product hardness, but also have low process efficiency, high cost, and difficult operation. At present, there is no high-hardness (ShoreD hardness ≥ 70) epoxy-modified polyurethane Related reports on the preparation of composite materials,

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