CS263268B1 - Gypsum compound for the production of fixation bandages - Google Patents

Abstract

The solution relates to a plaster mixture for the production of a fixation bandage, which contains 30 to 70% by weight of alpha-gypsum and/or beta-gypsum, preferably a mixture of alpha-gypsum and beta-gypsum in a weight ratio of 1:1, 27 to 67% by weight of mono-di-propylene glycol, or a technical mixture of mono-, di- and tri-propylene glycol from production, 0.1 to 2.0% by weight of cellulose acetate and 0.05 to 2.0% by weight of sodium or potassium salt of sulfuric acid or hydrochloric acid. The plaster mixture according to the invention may also contain a harmless biologically active substance. The system solves the problem of anchoring plaster to the supporting fabric with a binder - cellulose acetate. The use of a mixture of alpha-gypsum and beta-gypsum significantly improves the mechanical properties of the bandage.

Description

The invention relates to a gypsum composition for the production of a fixative bandage comprising gypsum, a solvent, a binder, a setting accelerator and optionally also an antimicrobial preparation.

Fixation bandages are produced in a known manner by applying to the textile support, for example, a mixture of gypsum, potassium sulphate, which acts as a setting accelerator, and methylhydroxypropylcellulose as a binder. Said components are dissolved and / or dispersed in a solvent which is a mixture of methanol and methylene chloride.

An improvement in the bandage property can be achieved by using a gypsum composition which, in addition to gypsum, contains 0.4% laurylpyridinium chloride, 0.2% 2-sulfamylaminothiazole and an organic quaternary ammonium compound.

It is known from the patent literature to solve the problem of fixation by a multilayer dressing, which consists of a backing layer, a foam layer, a layer of gypsum bandage and a flannel fabric.

These processes, using gypsum mixtures of different composition, have their drawbacks.

The use of a mixture of methanol and methylene chloride as a solvent in the manufacture of fixation bandages is inevitably associated with working in a health-damaging environment. In addition, decomposing methylene chloride destroys the production equipment.

These known methods are in common that they are concerned with improving the utility properties of the finished dressing, but do not address the technology of gypsum deposition and anchoring on the fabric.

The gypsum composition for the manufacture of a fixative bandage comprising gypsum, a solvent, a binder, a setting accelerator and, optionally, a biologically active substance according to the invention, characterized in that the gypsum mixture contains 30 to 70% by weight of alpha-gypsum, 27-67% by weight of mono- or di-propylene glycol, optionally a technical mixture of mono-, di- and tri-propylene glycol from production, 0.1-0.2% by weight of cellulose acetate and 0.05-2% by weight % By weight of sodium or potassium salt of sulfuric acid or hydrochloric acid.

The hardness and strength of the applied fixative bandage can be influenced within certain limits by the type of gypsum used. While alpha-gypsum is mostly obtained by treating chemical wastes as pure calcium sulfate, beta-gypsum is produced by dehydrating natural gypsum. Both modifications differ in their properties. Alpha-gypsum is whiter and cleaner because beta-gypsum contains various mineral additives such as metal sulphates, especially magnesium and manganese iron. Alpha-gypsum solidifies faster and is harder after setting, has higher strength, but is more fragile than beta-gypsum. Less gypsum is required to achieve the same strength of the cured bandage as with beta-gypsum. A gypsum bandage with alpha-gypsum can be thinner, lighter and more comfortable at the same strength and fixation as with beta-gypsum, but it is more fragile and there is a risk of rupture. When mixing alpha- and beta-gypsum, the fixative dressings have increased strength due to alpha-gypsum, while keeping the corresponding dressings. the level of elasticity given the presence of beta-gypsum. Optimum results are obtained when alpha-gypsum and beta-gypsum are used in a 1: 1 weight ratio to prepare the composition of the invention,

The gypsum composition for the production of the fixative bandage according to the invention may also contain a non-toxic biologically active substance from the group of alkyl tin compounds, such as hexabutyldistannoxane or tributylboridoxystannate, optionally a biologically and simultaneously surfactant from the group of organic quaternary ammonium salts.

The gypsum composition of the present invention is prepared by dissolving the cellulose acetate in the heat and mixing the gypsum, the setting accelerator and optionally the antimicrobial in the solution. It is necessary to maintain the temperature of the mixture above 60 ° C throughout the entire application process.

Examples

Example 1

In monopropylene glycol, 1.2 wt. % cellulose acetate, and 47 wt. 50% alpha-gypsum and 50% alabaster beta-gypsum and 0.7 wt. potassium sulfate.

Example 2

0.75% by weight of di-propylene glycol was dissolved at 80 ° C. % cellulose acetate and 42% wt. gypsum surgical, 0.35% wt. % potassium sulfate and 0.1 wt. sodium chloride.

Example 3

0.5% by weight of the technical mixture of mono-, di- and tri-propylene glycol was dissolved at 82 ° C. of cellulose acetate and 0.28 wt. potassium sulfate, 0.1 8 wt. % tributyl boritoxystannate and 52 wt. beta-gypsum.

Example4

0.05 g by weight was added to the gypsum mixture prepared in accordance with Examples 1 and thoroughly dispersed therein. hexabutyldistannoxane.

Example 5

The procedure of Example 1 was followed except that 0.3 wt.% Was used instead of potassium sulfate. sodium chloride.

Example 6

0.1% by weight of the gypsum mixture prepared according to Example 1 was added. tributylboronone stannate.

Example 7

To the gypsum mixture prepared according to Example 2, 0.5 wt. lauryldimethylbenzylammonium chloride.

Example 8

To the gypsum mixture prepared according to Example 3, 0.078 wt. chlorhexidine.

In the examples, the weight percentages are based on the total weight of the gypsum mixture.

Claims (3)

A gypsum composition for the manufacture of a fixative bandage, comprising gypsum, solvent, binder, solidification accelerator, characterized in that it contains 30 to 70% by weight of alpha-gypsum and / or beta-gypsum, 27 to 67% by weight of mono- or dl-gypsum. propylene glycol or technical mixtures of mono-, di- and tri-propylene glycol from production, 0.1 to 2.0% by weight of cellulose acetate and 0.05 to 2.0% by weight of sodium or potassium salt of sulfuric acid or hydrochloric acid and, optionally, biologically active substances. 2. The gypsum mixture of claim 1, wherein the gypsum mixture comprises 1: 1 alpha-gypsum and beta-gypsum. 3. A gypsum composition as claimed in claim 1, characterized in that it contains from 0.05 to 1.0% by weight of a biologically active substance from the group of alkyl tin compounds, such as hexabutyldistannoxane or tributylboritoxystannate, or biologically and surfactants from the group of organic quaternary ammonium salts. for example, lauryldimethylbenzylammonium chloride or biologically active chlorhexidine.