Tear-resistant mixed master batch suitable for mixing by twin-screw extruder

Abstract

The invention provides a tear-resistant mixed master batch suitable for mixing by a twin-screw extruder, the tear-resistant mixed master batch comprises a master batch A and a master batch B. The master batch A comprises the following components: EVA, a rubber component, a vulcanizing activator and an accelerant, but does not contain sulfur; and the master batch B comprises the following components: EVA (Ethylene Vinyl Acetate) and sulfur, but does not contain a rubber component. The mixed master batch provided by the invention has the characteristics of being suitable for mixing of a double-screw extruder, high in tear strength, easy to store for a long time, uniform in dispersion and the like.

Description

technical field [0001] The invention relates to the field of rubber pre-dispersed master batches, in particular to tear-resistant suitable twin-screw extruder mixing master batches. Background technique [0002] CN110722703A relates to a low-temperature continuous mixing production method of rubber. According to the principle of low-temperature mixing, continuous mixing produces rubber with excellent physical and mechanical properties. According to the principle of low-temperature mixing of rubber, it includes low-temperature master batching, feeding, and low-temperature final mixing. And the rubber mixing method of the filtration step, the raw rubber is put into the internal mixer for master mixing, then the extruder is used for cooling and continuous tableting, and then the low temperature supplementary mixing is carried out in the mixer, and finally the rubber filter is used to Filtration and molding to achieve high-quality, high-efficiency rubber compound production; hig...

AI Technical Summary

Problems solved by technology

CN106188819A discloses a rubber accelerator ETU pre-dispersed masterbatch and its preparation method. In parts by weight, the masterbatch consists of: 72-82 parts of N,N-ethylenethiourea, 8 parts of rubber carrier ~16 parts, EVA resin 2~4 parts, epoxyacetyl ricinoleic acid methyl ester 1~3 parts, saturated fatty acid zinc 2~4 parts, naphthenic oil 1~8 parts, color masterbatch 1~3 parts, the present The state-of-the-art rubber accelerator ETU pre-dispersed masterbatch is convenient for storage, transportation and weighing. Its preparation method is simple and operable, which can ensure the original activity of ETU and solve the problem of mixing ETU directly into rubber. The problem of agglomeration and uneven dispersion can also solve the problem of ETU dust pollution and avoid the health problems of operators caused by inhalation of ETU dust, but it does not solve the problem of mixing rubber with twin-screw extruders

This background technology mentions the use of pre-dispersed masterbatches of EVA and sulfonic yellow powder, but this technology only uses EVA in a small amount as a binder, and does not mention that EVA is used as a plasticizing phase with high fluidity at all. The amount of sulfur filling also makes EVA have no high-fluidity plastic phase function

At the same time, there is no way for this technical solution to be used for mixing rubber in the extruder.

[0006] Based on all the existing technologies that can be retrieved, there is no good solution for using twin-screw extruders for rubber mixing. The rubber mixing process of twin-screw extruders has not yet been industrialized, mainly because Due to the nature and shape of the rubber material itself, it is difficult to disperse well with powdered additives directly using a screw extruder

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