CS124991A2 - Wrapping of liquid chemical or dissolved or dispersed chemical in liquid or gel - Google Patents

Description

? «JUDr. J. TRA PLOVActive Office «Patents, ocivanr, *, signs to work in patterns, cíΓΓ, β ÍÍ5 u5 f-sahs i .Štěpánská 16

Packing of liquid or dispersed hemicellias or chemicals in liquid or gel form

Field of the Invention T3-i2

The present invention relates to a liquid chemical package or a chemical dissolved or dispersed in a liquid or gel contained in a water-soluble or water-dispersible material container.

BACKGROUND OF THE INVENTION Until now, most hazardous liquids have been stored in metal barrels or in plastic containers when it is desired to have smaller quantities of said hazardous substances.

Dangerous compounds, particularly those used in agriculture, have different dosage forms. However, it is advantageous for farmers to have agricultural chemicals in liquid form. Such formulated agricultural chemicals are easier to apply to the locality where they are intended to act, for example, by spraying. However, the formulation of hazardous chemicals in liquid form has some drawbacks and entails some difficulties. For example, the liquid may leak from the package or leak through leaks and holes. In addition, such a container may rupture when exposed to excessive load or impact.

It is very difficult to develop a packaging system that is suitable for the peasants, which would be successful in all manipulations and which would therefore be safe from an ecological point of view.

It is known to turtle into soluble artificially. However, tear-offs, which can be agricultural chemicals, can be bags or bags made of foil film, but can break or spill resulting in spillage of liquid agricultural chemicals with all the adverse consequences that such spills occur. As a rule, the plastic foil of which the package is made may contain different grades which lead to a weakening of the foil in some places of the package and which are a potential source of leakage of such a package. lacquer weak spots of the container are especially air bubbles, dust particles or other extraneous particles, or gel particles, both on the surface and on the carcase. inside the plastic mass from which z

Thereafter, if the film is exposed to such weak spots by repeated handling or, for example, impact, the film may rupture in such a weak area of the film to leak liquid from the package. This applies in particular to the production of agricultural chemicals, and sometimes distribution and application distributors, and peasants, are relatively coarse and therefore hazardous in their disposal.

Almost weak spots are presented, to a greater or lesser extent, in all types of film used, and their amount depends on the method of making the films. In the case of film making by casting, such a film may contain a smaller number of small holes / craters, although small gel inclusions are more often present. If the film is produced by extrusion, then it contains a plurality of said small holes. It is an object of the present invention to provide a new packaging system for agricultural chemicals that is safe in handling. another object of the present invention is to provide a new system for agricultural chemicals that can store and accommodate the handling of an end user, for example, a trader. It is also an object of the present invention to provide a new storage system for agricultural chemicals that reduces the risk of contamination and environmental damage and thus improves the ecology of handling agricultural chemicals.

Thus, the invention seeks to prevent leakage of liquids or dissolved chemicals through openings in the film from which the container is formed. Although the appearance of these small openings in the film is relatively thin, the presence of a single hole in many thousands of containers suffices to cause considerable damage, since the liquid runs out of the package and infects relatively broad surroundings.

SUMMARY OF THE INVENTION

The packaging system of the invention is characterized in that the hazardous material in liquid or gel form is contained in a water-soluble or water-dispersible bag made of laminated film.

According to a preferred embodiment of the invention, the hazardous compounds are agricultural chemicals, for example pesticides, plant protection agents or plant growth regulators.

The invention also includes packaging a hazardous chemical dissolved or dispersed in a liquid or gel contained in a water-soluble or water-dispersible laminated sheet.

Z Z

As used herein, the term "laminated film" refers to a film made of two or more originally separated layers that are joined together. These layers can be joined together in the form of a laminate by conventional methods. The layers can thus be joined by, for example, pressing, heating, crosslinking, building or adhesion, or using some combination of the techniques. The adhesion of said layers can be achieved by using separate adhesives or, where appropriate, water. When suitable water-soluble or water-dispersible layers are used, a particularly suitable process for obtaining a laminated follead adhesion of the individual separate layers is achieved either by the use of a PVA / low molecular weight (and / or) adhesive. simply using water. from

Since the laminated film is formed by two or more layers, the probability of the hole formation in such a laminated film is practically reduced to zero. This is due to the fact that it is very unlikely that the two holes in each one of the separate layers overlap each other to form a leaking opening from the package. In addition, the tensile strength of such multi-layer (e.g., double-layer) film is superior to tensile strength similar to that of a single layer.

The laminated films used in the present invention generally have a thickness of from 10 to 250 microns, preferably from 15 to 80 microns. The individual layers formed by the laminated films used in the present invention typically form half of said dimensions. When two layers are used, the thickness ratio of the two layers is generally in the range of 0.1 to 10, preferably 0.5 to 2. Generally, the sacks made of laminated film according to the invention have a content of 0 2 to 12 liters, preferably 0.45 to 6 liters.

The materials which may be used in the invention are water-soluble or water-dispersible materials which are insoluble in the organic solvents used to dissolve or disperse the chemicals contained in the materials of the present invention.

Suitable materials are polyethylene oxide or methylcellulose; however, a preferred material is a material which contains or is derived from a polyvinyl alcohol, i.e. a partially or completely alcoholized or hydrolyzed, for example alcoholized or hydrolysed, in the range of 4-0 to 99%, preferably in the range of 70-92%, of polyvinyl acetate.

The laminated film layers of the invention may be made of the same or different materials. Films made of different materials may have advantageous properties. For example, the inner layer of the wrapper may be made of a material that is more resistant to the action of the agricultural chemical than the material from which the wrapper layer is made. In addition, the outer layer of the wrapper may be selected to have one or more of the following properties: a / faster solubility in water (as compared to the inner layer of the wrapper or compared to a single sheet); b / improved mechanical properties including improved mechanical damage resistance; c / improved machinability; d / less sensitive to relative humidity; e / resistance to frost and / or high temperatures.

One or more layers of the laminated sheet may or may contain a plasticizer. Appropriate contents of a suitable seedling beads in the laminate laminate inner layer can improve the seal properties of the laminated film and make the film less susceptible to elongation. Such a film is easier to machine and the liquid-containing bag is also easier to close. A suitable plasticizer content in the outer layer of the laminated film and more resistant to the outer surface of the article is more flexible and mechanical damage at low temperatures or impact and movement. from

The individual separate layers of the laminated sheet of the invention can be made using a variety of techniques, for example by extrusion or casting. The laminate made from the layers produced by the different properties, including the higher ophthalmic processes, can have advantages, increased tensile strength and increased elongation resistance. The mentioned increased tensile strength and / or increased elongation resistance can only be achieved in one direction of the film. from

In the context of the invention, laminated films are used for the production of packages which do not have time-consuming and dangerous consequences, such as in the prior art packaging, from which the packaged fluid leaks out later on in the foil weaknesses discussed. during filling, as a result of the above

As already mentioned, the bags / or the container system may contain either liquids or gels. According to a preferred embodiment of the invention, the bags or said container system comprise a gel.

According to a preferred embodiment of the invention, the gels are selected in such a way that they have one or more of the following features: 1 / the resulting gels form a continuous system and / or 2 / the resulting gels have a viscosity of 1.5 to 51 Pa.s, more preferably 1 The viscosity measured by a uniform viscosity viscosity meter in the form of a flat plate rotating at 21 revolutions per minute (3), the gel has a phase difference between the controlled shear stress and the resulting shear stress of such a value that tg / t is less than or equal to 1.5, preferably less than or equal to 1.2; tg / f 1 / is the tangent - 7 - the angle ii / or the difference i; mt • _ θ '*?', r ^ t & directing the meter 4 with a fixed surface plate and a rotary cone arranged above the plate such that the angle between them is less than 10, preferably less than 4 °, said cone rotating by means of a motor with controllable the rotation being sinusoidal, that is, the torque and the angular displacement vary with the time as the sinusoidal function, this angular displacement corresponding to the aforementioned shear stress, the torque of the variable speed motor (which causes said angular displacement). the gels preferably have a density greater than 1, preferably greater than 1.1, 5 / gels have spontaneity (as defined below) of less than 75 preferably less than 25. by the following method: a mixture of 1 ml of gel and 99 ml of water was injected into a 150 ml vial. The number of rotations necessary to completely disperse the gel is called spontaneity.

By "continuous system" is meant a material that is visually homogeneous, meaning that it has an appearance as if it were a single phase, but does not exclude the possibility that small solid particles are dispersed therein provided that these particles are so small that they do not form a visible separate phase.

It is known that a gel is generally a colloid in which the dispersed phase is combined with a continuous phase to form a viscous product with a viscous appearance; it is also a dispersion system usually consisting of a high molecular weight compound or a small particle aggregate very closely connected to the liquid.

In order to form a shaped-shaped / easily formed bag generally capable of flowing, due to the high degree of gel engagement due to the aforementioned reason not to be woven. When it is bagged with heat. The gel also fills the gel, even if the size of the gel is very high. The container is filled with a very high viscosity and still has gels in the ground filled with gel, the bags must be closed into the

Gels are a slow flow used to freeze powders (which is used as usual)

The invention will now be described in more detail with reference to the following specific description of the invention, which is not intended to be limiting. EXAMPLE 1 A film in the form of a roll of two thinner films is prepared by lamination: the two films are made of up to 80% hydrolyzed polyvinyl alcohol (soluble in water), each of the films having a thickness of 25 microns. from krometers. One of the films contains 17 G of plasticizer and the other contains 15 G of plasticizer. The two films were joined together by heating (100 ° C) and compressed to form a single film of 50 microns. from

The laminated film is then used to make one liter bags containing a solvent-based liquid herbicide / mixture of ioxynil- and bromoxynil ester using a " form-and-fill " i - 9 -

The herbicide is in the form of a solution in a solvent consisting of a C10 aromatic hydrocarbon mixture. from

The foil is inserted into the machine so that the layer with the higher content of plasticizer forms the outer side of the produced bags of

The film is thus easy to machine. During the production, filling and transport of 500 bags, no leakage of herbicide from these bags was observed. EXAMPLE 2 A gel was prepared by stirring a mixture of the following ingredients at 50 DEG C.: active compound: 2,4-D-phenoxybenzoic acid iso-octyl ester: 64.8 .mu.m & solvent: aromatic solvent having a flash point of 65 DEG C. 24.2%, surfactant: a mixture of: nonionic and sulfonate mixed emulsifier: 4% calcium alpha-alkylbenzenesulfonate: 1, a gelatinizing agent: a mixture of sodium dioctylsulfosuccinate salt: 6¾.

The mixture is stirred and shaken until all the components of the mixture are dissolved or dispersed. 3-Stirring is first dissolved and then gelatinized. The gelation course is intensified by cooling to room temperature (20 ° C). The Brookfield viscosity of the gel is 3 Pa. Good stability of the emulsion is determined in the above assay. 1100 g of this gel is then introduced into a one-liter bag made of PVA film which is similar to that of Example 1. A bag that is almost full (about 95); The volume of the gel is then heat sealed. The density of both the gel and the bag containing the gel is 1.1.

This bag is then dropped ten times from the height of 1.2 m to the ground. No bursting of the bag was observed, nor was the leakage of the gel contained therein. Another bag made in the same way was tested for gel leakage in a flammable hole in its wall. The bag was pierced with a single needle (diameter 0.6 mm) for this purpose. A small drop of gel formed at the point of the opening, but it was too small for the bag to separate from the surface or to run down the surface of the bag. rJUDr, Jarmila Traplovd

Claims (8)

-11- PATE λτ T Ο V Ε "/ -, S, I 'A R Ο Κ · 1 · Packaging, which consists of a hazardous chemical dissolved or dispersed in the liquid or gel contained in the liquid. contained in the water-soluble or water-dispersed laminated film. Package according to claim 1, characterized in that the hazardous chemical is an agricultural chemical or a pesticide, or a plant protection agent or a plant growth regulator. Package according to claim 1 or 2, characterized in that the hazardous chemical is dissolved or dispersed in the liquid. Package according to claim 1 or 2, characterized in that the hazardous chemical is dissolved or dispersed in the gel. 3. The packaging according to any one of the preceding claims, characterized in that the laminated sheet has a thickness of 10 to 250 microns, preferably 15 to 80 microns. Package according to one of the preceding claims, characterized in that it has a dangerous chemical content of 0.2 to 12 liters, preferably 0.45 to 6 liters. Packing By About It From? wherein the water-soluble or water-dispersible laminated sheet is insoluble in a liquid or gel, wherein the water-soluble or water-dispersible laminated sheet is insoluble in liquid or gel. in which a hazardous chemical is dissolved or dispersed. 3. A molding according to any one of the preceding claims, characterized in that at least one of the laminated films is made of a material of the selected group comprising polyethylene oxide, methyleelulo or partially or fully alcoholized or hydrolyzed polyvinyl acetate. 9. A package according to claim 1, characterized in that the layer is made of polyvinyl acetate alcoholized or hydrolysed in the range of 40 to 99 76, preferably in the range of 7 to 92%. Package according to one of the preceding claims, characterized in that at least two layers of laminated film are made of the same material. Package according to one of Claims 1 to 9, characterized in that at least two layers of the laminated film are made of different materials. Packaging according to any one of the preceding claims, characterized in that the laminated film consists of two layers. Package according to claim 12, characterized in that the thickness ratio of the two layers is 0.1 to 10, preferably 0.5 to 2. 14 that the gel has a viscosity of 0.5 to 50 s, preferably 1 to 12 Pa s. Package according to any one of claims 4 to 14, characterized in that the gel has a phase difference between the controlled shear stress and the resulting shear stress of such a value that the phase difference tangent is less than 1.5 or equal to 1, 5, preferably less than 1.2 or equal to 1.2. Package according to any one of claims 4 to 15, characterized in that the gel has a spontaneity (as defined above) of less than 75, preferably less than 25-17. characterized in that it comprises laminating two or more layers together by pressure, heating, crosslinking, melting or water forming a laminated film. A package according to claim 1, characterized in that it is as described above. 19. The method of claim 17, wherein it is as described above. He represents JUDr Jarmila Trapfoviá