A kind of preparation method of environment-friendly rubber and plastic foam product not containing formamide

Abstract

The invention provides a method for preparing an environment-friendly rubber and plastic foam product without formamide, which belongs to the technical field of foam materials and comprises the following steps: mixing, mixing nitrile rubber, polyvinyl chloride and a foaming agent composition After adding, after high-temperature mixing, it is processed into a film; compounding: adding a vulcanizing agent to the film, performing secondary compounding, and processing it into a rubber strip; foaming, extruding the rubber strip into shape, and then vulcanizing and foaming Get rubber and plastic foam products. Wherein, the blowing agent composition includes a core-shell structure, which has: a blowing agent core containing bicarbonate and nitro arc; a shell surrounding the core, wherein the softening point of the shell is higher than the temperature at which the core decomposes into gas. The rubber-plastic foamed product prepared by the preparation method of the present invention has good foaming effect, and can obtain a uniform, dense, closed-cell and independent cell structure, so that the rubber-plastic foamed product has low water absorption and thermal conductivity, and is sound-insulating. The index is higher, and it has better heat preservation, waterproof and sound insulation effects.

Description

technical field [0001] The invention belongs to the technical field of foam materials, and in particular relates to a method for preparing formamide-free environment-friendly rubber and plastic foam products. Background technique [0002] Foamed materials have the advantages of low density, light weight, large specific surface area, high specific mechanical properties, and good damping properties. They are widely used in aviation, aerospace, atomic energy, medicine, environmental protection, metallurgy, mechanical construction, electrochemistry, and petrochemical industries. , and gradually developed into an excellent engineering material. The preparation of various foaming materials is inseparable from the use of foaming agents. The properties of foaming agents not only have a very important impact on the performance of foaming materials, but also have a great impact on their processing and molding processes. Therefore, foaming agents The research has become a research hot...

AI Technical Summary

Problems solved by technology

However, at present, the commonly used chemical foaming agent for NBR-PVC blended foaming materials is AC. Although AC has the advantages of non-toxic, odorless, and large gas generation, its decomposition temperature is high, there is a strong exothermic reaction, and the decomposition rate is too high. Fast, and formamide will be produced during the thermal decomposition of AC. Formamide remains in the foam material after foaming, and formamide is harmful to the human body. Excessive residual formamide will cause PS foam material to cause harm to users. Continuous damage, the existing solution is to add a formamide remover to the foaming material at the same time, and the existing formamide remover is relatively strong alkaline, which is easy to react with azodicarbonamide and affect the absorption of formamide effect, while increasing the amount of foaming agent used, it will also have an adverse effect on the foaming process of the foaming material

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