Preparation method of supermolecule/rubber airtight materials

Abstract

The invention discloses a preparation method of supermolecule / rubber airtight materials, in order to provide a method for improving the rubber gas barrier property by utilizing supermolecule LDHs (layered double hydroxides). The method comprises the following steps of: adding LDHs as packing into rubber, and preparing a compound of LDHs and rubber by adopting an emulsion compounded method or a mechanical alloying method. The main components comprise 100 parts of base body rubber materials and 0.2-40 part of LDHs by mass; the base body rubber materials are rubber emulsion or solid rubber; the supermolecule LDHs is adopted. The compound material with excellent gas barrier property can be obtained through filling the LDHs into rubber.

Description

technical field [0001] The invention relates to a method for improving the gas barrier performance of rubber, in particular adopting supermolecular LDHs with a layered structure as a filler, filling the rubber so that the gas barrier performance is greatly improved. It is suitable for tire inner tubes and inner liners, and can be applied to many fields of the national economy such as sealing of electronic components, medical rubber plugs, and nuclear, biological and chemical protection. Background technique [0002] The molecular structure of most rubbers is not dense enough and has a large free volume, so it is easy to form air passages. The best application effect in rubber airtight materials is halogenated butyl rubber, which has excellent airtightness mainly due to the dense arrangement of side methyl groups in its molecular structure. At present, adding inorganic phase materials to organic elastomer materials and using the gas barrier properties of inorganic phases to ...

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Problems solved by technology

Although this method has achieved a certain effect, there are still many difficult problems: ① Adding inorganic phase particles can reduce the effective volume of elastomer molecules, but the spherical inorganic particles such as carbon black used in the past have poor geometric barrier properties to gases, and It is easy to aggregate, and it is difficult to play the role of barrier gas; ② In the past, due to the limitation of the type and quantity of surface functional groups, it was difficult for inorganic particles to form physical viscous interaction with gas molecules to block the passage of gas. Be more prominent in bad times

However, there are still many problems in clay / rubber composites: ①The aspect ratio of clay is large, the geometric effect in a certain direction is weak, it is easy to show gas barrier anisotropy, and it is difficult to show excellent gas barrier properties; ②For materials with irregular geometric shapes such as clay, according to the crystal growth theory, crystals grow from the inside to the outside, and defects are easily formed at the edges of the crystals, so that the gas can easily pass through; ③In the existing preparation technology, in order to ensure air tightness, A large amount of clay needs to be added, but it is difficult to disperse a high amount of clay during composite processing, making it difficult for the overall performance of the material to meet the requirements of high-performance tire airtight materials

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