SU874730A1 - Composition based on natural rubber latex - Google Patents

Description

The invention relates to the rubber industry, relates to the development of a composition based on natural rubber latex, and can be used in the manufacture of latex tubes for medical purposes, using as a drainage after surgery. A known composition based on natural rubber latex includes sulfur, zinc oxide, vulcanization accelerator — zinc diethyldithiocarbamate, zinc ethyl phenyl dithiocarbamate, dispersant — a product of naphthalene sulfonic acid condensation with formalin, staticum — ammonium caseinate, nitrate nitrate sulfonic acid with formalin; -6-tert, butylphenol), polyvinyl methyl ether and water 1. However, this composition does not provide non-toxic products with low swelling in water for medical purposes by the method of thermo syphilization. The purpose of the invention is to obtain non-toxic products with a low swell, -. medical use of this composition in water by means of thermosensitization. , The goal is achieved by the fact that the composition, including sulfur, zinc oxide, vulcanization accelerator zinc diethyldithiocarbamate, ethylphenyl, zinc dithiocarbamate, dispersant -g naphthalene sulphonic acid condensation product with formalin, the stabilizer ammonium caseinate, antiannadehyde sulfonate acid with formalin, antimony-ammonium caseinate, antiannadellane-sulfate, ammonia-caseinate, antiannadell sulfate acid with formalin, antimony-ammonium-caseinate, anti-sodium-adyate-sulfonate acid with formalin, antimony-ammonium-caseinate, antianthiophenol –sulfonic acid with formalin, antimony-ammonium caseinate, antianthiophenol –sulfonic acid with formalin; methyl 6-tert.butylphenol) g polyvinyl methyl ether and water, the composition additionally contains chlorine sodium when comparing the components, wt.h .: Natural latex (dry residue) 100 Cera I, 16-lj3 Zinc oxide 0.24-0.3 Diethyldithiocarbamate zinc0.028- 0.3 Zinc ethyl phenyldithiocarbamate 0.77-0.88 Naphthalenesulfonic acid condensation product with formalin 0.48-0.58 Ammonium caseinate 0.12-0.22 2.2-methylene bis (4-methyl-6-tert.butylphenol) 1-2 Polyvinyl methyl ether1 5

Sodium chloride 1-15 water 49,5-155

The composition is prepared on the basis of a pure rubber.

The volcanic group includes sulfur — a volcanic euition agent, zinc oxide — a vulcanization activator, ethyl cymatol, Vulkacite P, extra N-vulcanization accelerators, a product of 2246 antioxidant, and surfactants. 50% aqueous dispersions of vulcanizing agents are prepared.

Dispersion 1 consists of sulfur, zinc oxide, ethyl cymate and 10% solutions of dispersant NF and ammonium caseinate - dispersion stabilizer;

dispersion 2 consists of vulkacit P extra N-vulcanization accelerators and 10% solutions of dispersant NP and caseinate ammonia; Dispersion No. 3 consists of the product of 2246 antioxidant and 10% solution of dispersant NF and ammonium caseinate. A 10% ammonium caseinate solution is prepared from casein, 25-30% ammonia and water. A 10% solution of the dispersant NP prepared by diluting with water of the original substance with a concentration of 39%.

An example. Preparing compositions for the manufacture of latex drainage tube, the compositions of which are given in table. one.

Table

Natural vulcanized latex100 Natural non-vulcanized latex -.100 sulfur-1,16 Zinc oxide-0.24 Vulcate P extra -N -0.77 Ethylcemate-0,028 Casein-0.12 Dispergator NF-0.48 Antioxidant 2246 -2.0 Ammonia -0.1 Polyvinyl methyl ether 2,55,0 Formalin 2,32,3 Potassium-rosin soap 0,330,33

In the inventive compositions, it can be used as pre-vulcanized latex. vulcanizing agents in which ifl are introduced in the process of its preparation on plantations, never vulcanized, requiring the introduction of a vulcanizing group.

In the case of the use of unconvolumed; 1 cured latex, the group of vulcanizing agents is introduced into it in the form of a 50% pre-prepared dispersion. The latex mixture is then subjected to vacuum for 2 hours to remove ammonia and lower the pH of the mixture and remove air bubbles. 10% solutions of sodium chloride and polyvinyl methyl ether are introduced into it.

In the case of the use of scorched Latex, only 10% sodium chloride solution and 10% polyvinyl methyl ether solution are introduced.

The obtained thermosensitive latex composition is extruded through a special device with 00100 --100100 - 1.301.16 - 0.30 0.24 - 0.80 8.7 - 0.030.028 - 0.220.12 -. -0,580,48 --1,02,0 - 0,20,1, 55,01,02,0 - with a heating jacket, get a tube in. the gel, which is washed in running water for 1 hour at room temperature, is dried at 70-90 ° C and vulcanized at 120 ° C. Parts 1, 3 and 4 are only dried at 90c.

Famous

Proposed As can be seen from the table. 2 strength characteristics and relative elongation of the films obtained on the basis of known and proposed compositions are almost the same. In the study of aqueous extracts of films containing formalin in the formulation (known composition), a significant migration of formalin into water was found. Consequently, the use of tubes bent from this composition as drainage will cause the formalin to migrate to the surrounding tissue, which is unacceptable. The migration of polyvinyl methyl ether and sodium chloride contained in the samples of the inventive composition is within the accepted norms. The water swellability of the products obtained using sodium chloride is 50% lower than the water swellability of the products obtained on the basis of a composition containing formalin, which

The results of sanitary-chemical studies, physicomechanical indicators and water-swelling capacity of products obtained by thermosibilitation under comparable conditions are given in Table. 2

Table 2:

Formalin 3.92

231 1080 PVME 0.19

246 1000 Formalin

3.80 PVME 0.17

Sodium Chloride 0.4

220 950 PVME 0.25

225 970 Chloride

sodium O, 30 PVME 0.21

230 960 Chloride

Sodium 0.52 PVME 0.19

225 970 Chloride

Claims (1)

Sodium 0,40 PVME 0,19 virtually eliminates the need to combat the stickiness of the products obtained from the proposed composition. The proposed composition, instead of toxic formalin, contains sodium chloride, which is a non-toxic substance, which reduces the swelling of products in water, which is especially important for medical devices that are in contact with water during sterilization. Claims Composition based on natural rubber latex, including cecv, zinc oxide, zinc oxide accelerator, zinc, ethylphenyldithiocarbamate, zinc, dispersed, and I, I, I, I, I, a naphthalene sulfonic acid, formalin, a stabilizer, amine, I, I, I, I, I, I, I, I, I, and I, -butylphenol), polyvinyl methyl ether and water, which is so that, in order to obtain non-toxic products with low swelling in water of medical purpose from this composition by the method of sensitization , The composition addi tional comprises sodium chloride at a ratio of components, May. including: Natural latex (dry residue) 100, 16-1.3 Zinc oxide 0.24-0.3 Zinc diethyldithiocarbamate0.028-0.3 Ethylphenyldithiocarba- .. zinc mat 0.77-0.88 Naphthalene sulphonic acid condensation product with formalin 0 , 48-0.58 Gshdaoni Caseinate 0.12-0.22 2,2-methylene-bis- (4-methyl-6-tert. Butylphenol) 1-2 Polyvinyl methyl ether 1-5 Sodium chloride 1-15 Water 49,5- 155 Sources of information that are taken into account in examination 1, R.J. Noble. Latex in the technique. Schimizdat, 1962, p. 462 (prototype).