SU765308A1 - Butyl rubber latex-based composition - Google Patents

Description

(54) COMPOSITION ON THE BASIS OF LATEX BUTYCHAIN

I

The invention relates to the rubber industry, in particular, to the development of a composition based on latex butypacouche.

A butyl rubber latex composition is known that includes sulfur, zinc oxide, zinc daethyl dithiocarbamate, sodium diethyldithiocarbamate 1.

However, the rubbers from this mixture have low antistatic properties that are not preserved during repeated boiling.

The purpose of the invention is to increase the antistatic properties and preserve them during repeated boiling of rubber from the mixture.

This is achieved in that the butyl rubber latex-based composition comprising sulfur,., Zinc oxide, zinc diethyldithiocarbamate and sodium diethyldithiocarbamate further comprises cotton or polynosic fibrous filler with a fiber length of 0.1-0.5 mm and a thickness of 0.133-0.200 tex, at the next component ratio, by dry residue, wt.h .:

Latex butyl rubber100

Sulfur2-3

Zinc Oxide4-5

Diethyldithiocarbamate

zinc2-5

Diethyldithiocarbamate

sodium 2-4

Fiber filler5-15

The fibrous filler (cotton, viscose or polynose) is prepared as follows.

Production of cotton pile (fibrous filler) consists of the following operations: cotton in the form of bales is loosened, then treated with an alkali solution to obtain L-cellulose, cut into holanders, dried, ground in ball mills with the addition of stearic acid in the amount of 3.0-5 , 0 wt.h. per 100 wt.h. a fiber backsplash to prevent sticking.

The production of viscose pile (fibrous filler) - a solution of cellulose xanthate in a dilute aqueous solution of alkali - consists of the following main stages: the treatment of the initial cellulose with an aqueous solution of alkali to obtain alkaline cellulose (mercerizing cellulose); grinding alkali cellulose to increase its specific surface area; pre-heating of silk cellulose, during which it undergoes oxidative degradation to reduce its molecular weight; the interaction of silk cellulose with CSa (xanthogeniciae) ;; dissolving cellulose xanthate to form viscose; preparing viscose for molding (filtration, air removal); Polynose fibers - cotton-like fibers, a kind of viscose fibers, with properties close to cotton. Polynose fiber is produced in the form of staple fibers. Polynomial fiber is produced mainly according to the same pattern as conventional viscose fibers. However technological

Cotton Viscose Polinozy

Example. A composition based on butyl rubber latex, 50% dispersion of sulfur, zinc oxide and zinc diethyldithiocarbamate in a 5% solution of leukanol is prepared. Sodium diethyldithiocarbamate is administered in the form of a 25% aqueous solution.

The composition of the latex mixture

Butyl rubber latex (40%) Sulfur dispersion (50%) Zinc oxide dispersion (50%)

Zinc diethyldithiocarbamate dispersion (50%)

Sodium diethyldithiocarbamate solution (15%)

Fiber filler (pile)

0,200-0,143 0,167 .0,167-0,133

Various types of fibrous fillers are introduced into the composition with continuous mixing.

The composition is presented in table. 2

table 2

Mass. dry matter

250

100

2

four

four

26 5-15. 5-15, the molding modes of the polynomial fibers and conventional viscose fibers are different. The cutting and preparation of viscose and polynose fibers is carried out on different types of hair cutting machines. Before feeding the fiber into the machine, a bundle is formed by adding individual bundles with 6-10 large coils. The final bundle has a linear density of about 0.2-2.0 million tex. As a rule, the harness is moistened with a special solution before serving on the pile cutter to improve the cutting conditions and prevent the ends of the hairs from being oily when cutting. Further technological process of preparation of the pile consists of the following stages: washing, dyeing, processing, drying and screening. In tab. 1 shows the characteristics of various types of fibrous fillers. Table 1 Films are prepared from the hydrogenation of the composition by ion deposition, drying them for 4-5 hours at 50 ° C. They are placed in a MFCC 4 U pip. C (L °) and vulcanized in a steam boiler for 2025 minutes at 150 ° C.

As can be seen from the data table. 3, with the introduction of lint, the electrical resistivity decreases to 10 Ω cm, and the physicomechanical properties of the films remain at a known level.

Improving the electrical properties makes it possible to use the proposed composition to obtain rubber, and coatings with antistatic properties.

A further increase in the dosage of the fibrous filler (pile) only slightly changes the electrical resistance of the films.

Specially conducted studies on the introduction of lint into other types of latex (polychloroprene, natural) showed that in these cases the electrical resistance of the films does not change.

Thus, the use of the composition of the latex mixture allows to obtain

Table 3

light and color films with antistatic properties. In addition, it eliminates the need for preliminary preparation of an antistatic filling agent surrogation, which considerably simplifies and reduces the cost of the process for preparing the latex mixture. Products made from such films can be subjected to repeated boiling in water without changing the electrical conductivity.

Claims (1)

Invention Formula A composition based on butyl rubber latex, including sulfur, zinc oxide, zinc diethyldithiocarbamate and sodium diethyldithiocarbamate, is characterized in that, in order to increase the antistatic properties and retain them at boiling multiple times. Table 3 shows the data on the evaluation of the elec- - -f f-it t4ftttl f IIV / .ri & -JJI Vl4 tricodectant and fienko-mechanical properties of films obtained from latex mixtures. This one with different types and amount of nap. rubber from this mixture, additionally contains cotton or polinozny fibrous filler with a fiber length of 0.1-0.5 mm and a thickness of 0.133-0,200 tex, with the following ratio of dry matter components, mass: Latex rubber 100 Sulfur2-3 Zinc Oxide4-5 Diethyldithiocarbamate zinc2-5 Sodium diethyldithiocarbamate 2-4 Fibrous filler5-15 Sources of information, taken into account in the examination 1. V. P. Bugrov et al. Effect of different types of carbon black and zinc oxide on the properties of butyl rubber latex films. -Kauchuk and. tires 1976, No. 2, p. 17 (prototype).