SU1137100A1 - Composition based on isoprene rubber - Google Patents

Abstract

HA COMPOSITION HA BASED ON LATEX YOPROBEN RUBBER, INCLUDING Sulfur, Zinc Oxide, Zinc Mercaptobenzothiazolate, Zinc Diethyldithiocarbamate, IS

Description

The invention relates to the manufacture of latex articles, in particular protective gloves, with reduced flammability. Compounds such as chlorine paraffins combined with alkali metal and alkaline earth metal borates l, -1decabromodiphenyl t2 bromine-containing phosphates 3 are used as fire-fighting additives to protect natural and butyl rubbers. These compounds do not give the required flame retardant effect or they cannot be put into latex at all, since they destabilize the latex system. A known butyl rubber latex composition containing a combination of flame retardants consisting of hexabromobenzene, chloroparaffin, antimony trioxide 4J. The disadvantage of this composition for carpet carpet decoration is that in order to achieve a noticeable flame retardant effect, it is necessary to introduce more than 80mAh, the indicated combination of fire retardants, which causes a sharp deterioration of the physical, mechanical and elastic properties of the products. At the same time, even such filling with the indicated antipyrenes gives the required flame retardant properties, while smaller amounts do not provide the required flame retardant properties. The composition based on unsaturated rubber latex, including sulfur, zinc oxide, zinc accelerators, mercaptobenzothiazole t of zinc and diztill, is closest to the proposed technical essence. Zinc dithiocarbamate, as well as antioxidant-H- (1,3-dimethylbutsh1) -M-phenyl-p-phenylenediamine, chloroparaffin and bromine containing flame retardant-pentabromtoluo Z. However, fire Kie properties of this composition are insufficient. The purpose of the invention is to increase the fire resistance of latex products. This goal is achieved in that a composition based on an isoprene rubber latex comprising sulfur, zinc oxide, zinc mercaptobenzothiazolate, zinc diethyldithiocarbamate, N- (153-dimethylbutyl) -K-phenyl p-phenylenediamine, chloroparaffin, and a template, a template, a template, a template, a package, a template, a template, a template, a template, a template, and a template. the antipyrene contains M-4-aminophene-Stebrabromophthalmide and additionally antimony trioxide in the following ratio of components, wt.: Isoprene rubber latex (for dry substance) 100 Sulfur 1,2,2,6,6 Zinc oxide 5,0-5,4 Zinc mercaptobenzothiazolt. 1.8-2.2 Diethyldithiocarbamate Pink1.4-1.8 N - (1,3-dimethylbutyl) - N-phenyl-p-phenylenediamine, 7 Chloroparaffin 15-20 N-4-aminophenyltetra-. bromophthalimide 20-30 antimony trioxide 8-10 Used in the proposed composition H-4-aminophenyltetrabromoft limide or otherwise called tetrabromophthaloaminobenzene b has the formula This is an amorphous orange powder, poorly soluble in benzene and acetone, soluble in xylene and acetic anhydride, has a temperature of 31; -317 C. Examples. Latex compositions are prepared in a conventional manner by preparing dispersions of ingredients and displacing them with latex. . The compositions of the composition based on natural latex and the properties of the films of them are given in table. 1, and the composition of the compositions based on the latex SKI and the properties of the films - in table. 2. The fire resistance of the films is evaluated according to GOST 15898-70 on an OT-68 device with a vertical sample position and a flame at the bottom. The duration of exposure to the flame is measured, after which the samples stop burning immediately, i.e. self-extinguishing occurs; fire resistance, as well as the duration of residual smoldering of the samples after the termination of their combustion;

3. 1

the properties of the latex films are determined by. GOST 12580-79.

As can be seen from the presented data, the use of N-4-aminofelyltetrabromophthalimide in combination with chloroparaffin or hexabromobenzene and antimony trioxide makes it possible to obtain a product based on natural rubber, which has high fire resistance and satisfactory physicomechanical properties. To obtain such an effect of firestorms using hexabrombazole with chloroparaffin and cypbtfti trioxide, it is necessary to introduce into the latex mixture in the amount of 50, 20 and 10 mas. respectively. When this occurs, the sharp physical and mechanical properties of latex films occur.

371004

It should be noted that when using the proposed combination of flame retardants, the very nature of the combustion of the samples changes significantly. Thus, the formation of a rigid skeleton formed by coke and preventing the spread of flame over the surface of the sample is observed. At the same time, after the transfer of the samples from the flame, they are instantly 10 but fade out. ;

The test results show that N-4-aminophenyltetrabromophthalimide is effective for latex films derived from SKI latex.

15 Thus, the proposed composition allows obtaining latex products with reduced flammability without changing the traditional technology and improving the mechanical, properties can be easily introduced into the industry.

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Claims (1)

COMPOSITION BASED ON ISOPRENE RUBBER LATEX, including sulfur, zinc oxide, zinc mercaptobenzothiazolate, zinc diethyl dithiocarbamate, U - (1,3-dimethylbutyl) -N-phenyl-P-phenylenediamine, chlorine-paraffin, and that the purpose of increasing fire resistance, as a bromine-containing flame retardant, it contains N-4-aminophenyltetrabromphthalimide and additionally antimony trioxide in the following ratio of components, parts by weight: Isoprene rubber latex (dry substance) 100 Sulfur 1.2-1.6 Zinc oxide Mercaptobenzothiazolate 5.0-5.4 zinc Diethyldithiocarbamate 1.8-2.2 zinc N- (1,3-dimethylbutyl) - 1.4-1.8 - N-phenyl-p-phenylene- diamine 1.3-1.7 Chloroparaffin N-4-aminophenyltetra- 15-20 . (bromophthalimide 20-30 Antimony trioxide 8-10 SU _t , 1137100