SU1623995A1 - Method for processing organo-silicon waste - Google Patents

Abstract

The invention relates to methods of processing waste production of silicone rubber, rubber compounds, compounds and their vulcanization, and can be used to obtain rubber mixtures. The invention allows to expand the assortment of recyclable waste, reduce environmental pollution and simplify the recycling process. The method consists in that the waste that is ground to a particle size of not more than 3 cm is treated with a mixture of tetraethoxynsilane, water and potassium hydroxide at 60-70 ° C for 3-8 hours, followed by filtration of the mixture. In this case, the waste is loaded in three steps in equal amounts of the total load. The reaction mixture comprises, in wt.%: Organosilicon wastes 40.0-50.0; tetraethoxy silane 48.3-58.3; water 0.6-0.7 and potassium hydroxide 0.9-1.0. 2 tab. ё "About

Description

The invention relates to methods for processing waste from the production of silicone rubbers, rubber compounds, compounds and their eruptions and can be used in the preparation of rubber compounds.

The purpose of the invention is to expand the range of recyclable waste, reduce environmental pollution and simplify the recycling process.

The method involves shredding waste to a particle size of not more than 3 cm and treating it with a mixture of tetraethoxysilane, water and potassium hydroxide at 60-70 ° C for 3-8 hours, followed by filtration. In this case, the waste is loaded in three steps in equal quantities.

Examples 1-14. Waste in the examples recycled in this way. The compositions of the reaction mixtures and process parameters are given in table. 1. Recycled silicon-organic wastes are used as one of the ingredients of the re-glass-fiber material RETSAR (TU 38. 103172-80).

The composition of the rubber compound applied to glass fiber, mac.h: Methylvinyl dimethyl-siloxane rubber SKTV1 (OST 38. 0310-78) 92

Borsiloxane polymer BSN (STP 38. 1451-79 ma.dol boron

 ™

WITH

with U1

in terms of boric acid 20%) 8

Dioctyl sebacate (GOST 8728-77) 3

Aerosil brand A-175 (GOST 14922-77) 35

Iron oxide pigment (TU 6-10-1618-77,

ma.dol iron in pe

Counting on Fe205 98%) 10

Silicon Waste37

The rubber mixture is prepared in a rubber-blender, and then on a calender it is applied to fiberglass (GOST 19907-83) and vulcanized at the RV-1200 radiation installation. The absorbed dose of gamma radiation is 60 kJ / kg (6 Mrad). The properties of the vulcanizates are given in Table 2.

Claims (1)

Invention Formula A method for processing organosilicon wastes, which includes grinding the waste and treating it with a mixture containing tetraethoxysilane, characterized in that, in order to expand the range of recyclable waste, reduce environmental pollution and simplify the recycling process, the waste is crushed to a particle size of not more than 3 cm and carried out their treatment at 60-70 ° C for 3-8 h with a mixture of tetraethoxysilane, water and potassium hydroxide in the following ratio of components of the reaction mixture, wt.%: Silicone waste 40.0-50.0 Tetraethoxysilane 48,3-58,3 Water 0.6-0.7 Potassium hydroxide .0.9-1.0, followed by filtration, and the waste is loaded in three steps in equal quantities of the total load with an interval of 1 h. Note; k - test cases. Table 1 Autogenesis of glass rubber with aging for 3 hours at 150 ° C. Conventional strength (22 + 2 ° C), MPa. Conventional strength after aging for 72 hours at 150 ° C, MPa. Dielectric properties: electrical strength, kV / mm specific volume resistance, Ohm-cm No delamination of the rubber layers 42.3 41.7 42.2 42.0 42.8 42.1 41.8 41.9 41.8 41.9 41.8 42.1 41.9 39.0 14.9 15.6 15.6 15.8 15 15.3 15 15 15 15.7 21 22 22 21 22 22 22 22 21 21 22 21 2120 2-S 2-10 s2 | o «$ 3 Z.lo Vl o 2-10 L o S-Yu L o l MO -io 1,101E