SU428951A1 - METHOD FOR THE REGENERATION OF RUBBER ON THE BASIS OF BUTADIEN-NITRIL RUBBER - Google Patents

Description

one

This invention relates to a rubber regeneration technology and is intended to produce rubber regenerate based on nitrile-butadiene rubbers using a thermomechanical method.

It is known that arylamines, phenyl-p-naphthylamin, can be used as activators of rubber regeneration based on butadiene-nitrile rubbers.

The purpose of the invention is to expand the range of compounds of the class of arylamines, suitable for use as activators of rubber regeneration based on butadiene-nitrile rubbers, and in improving the elongation of vulcanizates and nitrile regenerate.

The essence of the proposed method consists in using N-phenyl-N-isopropyl-rt-phenyl diamine a as an activator in the preparation of nitrile regenerate.

Example 1. Manufacturing waste molding on the basis of SKN-40M, crushed to a particle size of 1-1.5 mm, is regenerated by a thermomechanical method in laboratory conditions in a worm devulcanizer with a worm diameter of 85 mm with gaps in the syringes 1 and 1.5 mm and temperature in the head of a devulcanizer is 155-170 ° C.

The composition of the regenerated mixture (wt. H): Rubber crumb100

The softener (rosin) 15

Activator (M-phenyl-Misopropyl-p-phenylenediamine) 5-7

For comparison, indicators of regenerate obtained using phenyl-p-naphthylamine as an activator are given.

The results are shown in Table. 1. Example 2. Manufacturing waste molding on the basis of SKI-40, crushed to 1-1.5 mm in size, is regenerated by a thermomechanical method in semi-production conditions in a worm devulcanizer with a worm diameter of 115 mm, with gaps in the syringes 3 and 4 mm and a temperature in the head of a devulcanizer is 175-185 ° C. The composition of the generated mixture (weight. H.): Rubber crumb100

The softener (residue

atmospheric distillation of shale tar atmospheric residue 15 Activator (L-phenyl-Misoyl propyl-p-phenylenediamine) 5 For a comparison, the regenerate values obtained using phenyl-r-naphthylamine as an activator are given.

The results are shown in Table. 2

From the data given in table. 1 and 2, it follows that: the nitrilpy regenerate obtained with 1-phenyl-L-isopropyl - “-phenylenediamine, when used as rosin softener, is somewhat superior in plasto-elastic properties, and when used as a softener of atmospheric residue , equivalent to the regenerate obtained with fennl-rnaftilamino.

In addition, the vulcanizers of nitrile regenerate, obtained with M-phenyl-N-isopropyl-p-phenylenediamine, have a higher relative elongation compared to the vulcanizates of nitrile regenerate, obtained with phenyl-p-naphthyladtine.

T a b l and c a I

Activator, weight. Part of the Invention Yu. A method for regenerating rubbers based on butadiene-nitrile rubbers by a thermomechanical method using arylamine-class regeneration activators, characterized in that

table 2

Indicators of regenerate, in order to expand the range of activators and increase the relative elongation of vulcanizates of nitrile regenerate, H-phenyl-Yisopronyl-1-phenylenediamine is used as an activator in the amount of I- 7 wt. hours per 100 weight. including rubber crumb.