RO109548B1 - Anti static and fireproof transport bands ( conveyors ) cover making composition - Google Patents

Abstract

The present invention is part of the the field of rubber processing and solves the problem of obtaining the carriage of the transport belts for underground. Composition for manufacturing carriage of transport belts, antistatic and flame retardant, is based on a proportion of rubber polychloroprene reduced by 40% relative to the compositions conventional and contains, in addition, butadiene-styrene rubber, natural rubber, antimony trioxide and kaolin.

Description

The present invention relates to a composition for the manufacture of the housing of antistatic and flame retardant conveyor belts.

There are known compositions for the manufacture of the conveyor belt but which contain large quantities of polychloroprene rubber, a product that is very difficult to access and cannot be processed on the grille, 0.6 mm sheet and, moreover, the mixture for the construction of the mining belt case had to be found. an accomplishment solution, with as little combustible material as it must protect the burning of the textile insert and in addition, the adhesion required in STAS 2077/3 - 93 must be achieved.

The composition for the manufacture of the conveyor belt eliminates the above disadvantages by eliminating the black smoke and using different proportions of styrene trioxide, alumina, kaolin and chlorparafin, and in that the following composition was used to obtain the antistatic and flame retardant properties: natural rubber RSS1 type from 10 to 20 parts by weight to 100 parts polymer, Rodipol polybutadiene rubber, with Mooney viscosity ML 1-4 (100 ° C) from 40 to 50, from 5 to 10 parts by weight 100 parts polymer, butadiene-styrene rubber type Carom 1500, with Mooney ML viscosity 1-4 (100 ° C) from 46 to 58 units, from 20 to 30 parts by weight per 100 parts polymer, polychloroprene rubber W or WB sulfur free, with Mooney ML1-4 viscosity (100 ° C) from 40 to 50 units, from 15 to 20 parts by weight to 100 parts polymer, polychloroprene rubber mo sulfur-hardened with Mooney MLl-4 viscosity (100 ° C) from 40 to 50 units from 35 to 45 parts by weight per 100 parts polymer, block trioxide from 18 to 20 parts per 100 parts polymer, kaolin from 25 to 30 parts by weight per 100 parts polymer, alumina 10 parts by 100 parts polymer, chlorparafin K 71 from 14 to 18 parts by weight per 100 parts polymer, cumin-indene resin 2 parts by weight 100 polymer parts, magnesium oxide from 3.5 to 4 parts by weight per 100 parts polymer, sulfur from 1.1 to 1.3 parts by weight per 100 parts polymer, zinc oxide 3.5 parts by weight at 100 parts polymer, ethylentiourea accelerator from 0.3 to 0.5 parts by weight per 100 parts polymer, accelerator Ncyclohexyl benzthiazole sulfenamide from 0.8 to 1.1 parts by weight per 100 parts polymer.

The invention has the following advantages:

- the bands thus made have antistatic properties;

- the bands have flame retardant properties;

- the composition has a good workability;

- the composition ensures a good adhesion to the cloth-rubber;

- the composition has a low consumption of polychloroprene rubber.

An example of the invention is given below.

Weigh each ingredient as follows: natural rubber RSS1 14 kg, polybutadiene rubber Rodipol 8 kg, butadienstyrene rubber Carom 1500 33 kg, polychloroprene sulfur-free rubber WB 25 kg, polychloroprene rubber modified with sulfur GRT 62.5 kg, carbon dioxide 25 kg, kaolin 40 kg, alumina 15 kg, chlorparafin K 71-20 Kg, coumarin-indenic resin 3 Kg, fatty acids 0.5 Kg, magnesium oxide 5.5 Kg, sulfur 1.6 Kg, zinc oxide 5 Kg , ethylentiouree accelerator -0.5 Kg, Vulcacit Cz-1.2 Kg accelerator.

The composition is made in the 230 1 mixer, as follows: the polymers are kneaded from 1 to 3 minutes, the magnesium oxide is introduced, the coumarin-indenic resin, the fatty acids are kneaded for 1 min and 30 s for up to 2 minutes, the ammonium trioxide, kaolin, alumina and chlorparafine K71 and knead for 1 to 2 min, then zinc oxide and accelerators are introduced and knead for 1 min.

The temperature of the mixer is maintained at

100 ° C.

The mixture falls from the mixer on roll 1 of 84 where it is supplemented with sulfur and homogenized for 4 to 5 min.

The homogenization is continued on the second roll of 84, for 5 to 6 min. The mixture is removed from the continuous sheet from the roller, chopped, cooled and stored on pallets.

The physical-chemical characteristics of the product are shown in the tables.

Table 1

Adhesion in the tape

Characteristic In normal condition In wet condition imposed obtained imposed obtained 1. Adhesion between inserts, N / mm, min 5 6 4 5 2. Adhesion between the inserts and the rubber casing, N / mm, min 4 5 3 4

Table 2

Flame behavior

Characteristic Conditions of admissibility Verification method 1. Introduction to the free atmosphere STAS 8893-86 Duration of flame persistence: - the sum for each group of 6 tests, s, max 45 - for each test tested, s, max 15 Flame recurrence The flame does not have to reappear after applying the airflow 2. the burning test in the gallery - appearance of specimens after exposure To remain intact a portion of burning in the gallery. tape at least 25 cm long my equal with the width of the specimen

Table 3 friction test on the drum

Characteristic Conditions of admissibility Verification method - the appearance of the flame during the test in a quiet atmosphere and respectively in air flow Not allowed STAS - the occurrence and splitting of incandescent particles during the test or at the end, in a quiet atmosphere and respectively in air flow Not allowed - temperature of the surface of the drum during the test and at the end, ° C, max 300

Claims (1)

Claim Composition for the manufacture of the housing of the antistatic and flame retardant conveyor belts, 5 characterized in that it consists of the following components: natural rubber of type RSS1 from 10 to 20 parts, polybutadiene type Rodipol rubber with Mooney viscosity MLl-4 (100 ° C ) from 40 to 50, from 5 to 10 parts by weight, butadiene-styrene rubber type Carom 1500, with viscosity Mooney MLl-4 (100 ° C) from 46 to 58 units, from 20 to 30 parts, polychloroprene rubber without W or 15 type sulfur WB, with Mooney MLl-4 viscosity (100 ° C) from 40 to 50 units, from 15 to 20 parts, sulfur-modified polychloroprene rubber, with Mooney ML1-4 (100 ° C) viscosity from 40 to at 50 units, from 35 to 45 parts, chisel trioxide from 18 to 20 parts, kaolin from 25 to 30 parts, alumina 10 parts, chlorparafin K 71 from 14 to 18 parts by weight, resin cumeronindenic 2 parts by weight, magnesium oxide from 3.5 to 4 parts, zinc oxide 3.5 parts ethylenedioide from 0.3 to 0.5 parts, N-cyclohexyl benzylthiazole sulfenamide accelerator from 0.8 up to 1.1 parts, parts by weight being related to 100 parts polymer.