CS213620B1 - Packing blowable foil - Google Patents

Abstract

An intumescent composition which can be applied to an article as a solution or as a putty contains the following ingredients: a binding agent; an inorganic phosphate; a melamine type compound; starch, dextrin or carboxymethyl-cellulose; pentaerythritol; and optionally a foaming agent.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealable foil for sealing joints in a fire, optionally as a fire protection barrier for the isolation of flammable or fire resistant materials, and to a process for the manufacture thereof.

Currently, fire protection of all materials and structures is solved in several basic ways. It is mainly the mooification of the raw material introduced! so-called · reactive flame retardant · This method is applied first! for synthetic materials or chemically modified natural materials · Mel. the most common reactive retera are especially halogens and among them. most preferably chlorine and bromine compounds. Likewise, phosphorus compounds, less often boron, zinc, etc. are used. · Eynergics may be added to enhance the effect, usually antimony compounds ·

A large number of synthetic sands, teraoplastics, etc. are produced worldwide on this basis. Randomly mentioned products based on hexachloro-methyleniline-tetrahydrophthalic acid are also used at the same time. In the same way, accumulated compounds such as eetraVromfetlanhlirii (GB Pat. No. 1,100,605) have recently been used. ), reactive phosphorus-based systems are described and increasingly used - for example, U.S. Pat. No. 3,433,854 ·

The general features of reactive retarder systems are above all very good processing of lnoot, unchanged processing properties and relatively wide usability · K negative! Features include especially low efficiency, usually changes in physico-mechanical properties below the level of unmodified starting component and above all high production costs ·

Addition of flame retardants is an additional way to protect the diet and the prooi otai construction. This system may include, in addition to a wide variety of powder, paste or liquid additives, so-called "impregnation systems" to reduce the flammability of wood and wood products. almost the same as reactive retarders · These are mostly additives that by thermal decomposition during the flame exposure either create non-combustible gases, or cool the surface of the burning object below a critical temperature, or create a voluminous carbon residue that prevents air access to the surface of the object A large number of active systems are currently available. Most of them are aluminum hydrate at the same time. However, there are two more on the market. For example, the GB belongs to 1 100 605. solutions využžvatí br s ^ ^c Aromatic Hydrocarbons (e.g., octa, nona to nitroglyceride, cf. AO No. 165 696 discloses the halogenation of phenyl phenyl together with aluminum hydrate and antimonytriosyrd). A variety of reactive and additive systems are available for various uses. which often contain, in addition to halogens, phosphorus, zinc borate, barium borate, etc.

Most of these systems have disadvantages in addition to their positive properties. For example, all additive systems containing a higher percentage of additive components are usually less complicated, with physico-mechanical properties. with adidv content - they drop very fast · Some additive retarders over time in the hmmt of the blood, which gradually leads to the loss of their function ·

Another method of protection of all mmate flame retardants is the so-called surface protection, whether by coating, spraying, foil or tiling. This protection is no longer a great deal of inertia, because it does not only reduce flammability but also heat it

213 820 insulates · Фо is particularly important for materials that do not burn alce but which have relatively low thermal stability · This includes, for example, all steel building structures · Commonly used current systems include, in particular, protective coatings and alkaline silicate foils. Thus, for example, silicate foil reinforced with metal and glass mesh is produced, which very effectively protects against the fire of wooden structures. No. 186 354 foamable film based on urea-formaldehyde resin in combination with diammonium phosphate on an aluminum support reinforced with glass. Other well-known products are polyvinylidene chloride-based sealing tapes, reinforced with synthetic and glass fibers again.

The same function is also used for fire protection coatings. These materials, we can say the plaster mixtures are applied by means of gun spraying guns and their base is usually asbestos, vermiculite or mica, various siliceous fillers, etc. The product names are very different, the products differ mainly in the content of the individual components and the types of fillers used, some of which are often fibrous. These coatings usually reach a thickness of several centimeters and their main purpose is protection and thermal insulation of the structure The coatings are primarily low adhesion to the surface of the structure to be protected, high weight, low resistance to water and weathering and high labor intensity, since they are usually applied in many layers in succession in order to achieve an adequate thickness.

The last method of protection currently used is tiling. These tiles are mostly used for higher stresses and are based on ceramic or silicate boards, mineral wool and combinations thereof. They are fixed mechanically to the structure. Their main disadvantage is very high weight and high labor intensity.

The most progressive type of protection of materials and structures is, as is clear from the above, a fire protection coating and foil system. Usually, the coatings and foils are formed on the same basis and * the difference between the coating and the foil is often wiped off during application · Generally, a foil that retains its own homogeneity and strength in the surface and which is capable of operating independently when removed from the substrate . Conversely, a film of the type mentioned may be formed by coating directly onto the substrate. Thus, these systems differ for example from most water-soluble, previously used, so-called barrier systems, which are either very brittle and burst under mechanical stress, or in front of incoherent paints, which often oxidize or age and release various particles from the surface and siliceous coatings, zinc chromate systems, etc.) The films may either be reinforced or not reinforced, depending on the method of application.

• A particular problem of these - so-called intumescent protective systems - is that it is necessary to formulate specific, often only slightly different material mixtures, which are always optimal only for a particular material or material group, application or use. (Often, only a small change in formulation, a change in a single agent or a basic binder, or even a change in binder concentration, increased solvent or plasticizer content will cause major changes in the structure, reaction or behavior of the resulting product

213 «28 functional conditions.

Obviously, although the basic principle of all these systems is common, ie the mixture must always contain a combination of blowing agent, catalyst-and carbohydrate in a particular carrier, the effect of the individual components and their interaction is so specific * that the individual compositions cannot be directly derived from known principles or just a list of components. This is also a major drawback of the above-mentioned foil systems, which force manufacturers to formulate specific compositions for various uses. One of the material compositions which provide a very broad application in the field is the sealable foil according to the invention.

The invention is based on a mixture of 20 to 250 parts by weight of a rubber or polyvinyl acetate binder, 5 to 40 parts by weight of ammonium phosphate, calcium or sodium, 3 to 40 parts by weight of cyanuronic acid amide, 5 to 30 parts by weight of starch * dextrin and / or carboxymetaloelulose 5 to 40 parts by weight of pentaerythritol 5 to 50 parts by weight of a blowing agent, preferably 1 * 1 azobisformamide or hexamethylenetetramide hexane, and not more than 180% by weight, based on the total weight of the glass mineral reinforcing material, microballoons or siliceous fillers, wherein the reinforcements and fillers may be combined with each other.

The mixture is applied directly from the solution to the substrate to be protected so as to form a layer of at least 0.2 mm during application. The application is carried out in one or more operations * until the required film thickness is obtained. _; Similarly, a mixture of the solutions can be applied either by impregnation by pouring, cementing or laminating to the respective carrier * in one or more layers. The basic advantage of the proposed solution is above all the high efficiency of the foil or tape produced in this way. It has been found by tests that the foil of the proposed thickness is foamed up to a layer of 30 to 35 mm, depending on the type of stress, while the foam remains compact and stable. Unlike most other types of film, this blend is waterproof * elastic * and can be easily shaped and not subject to any long-term changes or influences. A considerable advantage is also the method of its application from solution, which is of great importance on the rugged parts or where the attachment of the pre-fabricated layer would cause difficulties. This also reduces the laboriousness of its use compared to other similar materials.

The possibility of reinforcement into various materials and fibers also provides advantages. By the type of reinforcing element used, it is possible to prepare sealing inflatable foils of different properties with different foaming ratio and also with different cost, corresponding to the type and requirements imposed on it. This has the further advantage that a relatively wide variety of foils and tapes of precisely graded properties can be produced.

Example 1.

The sealable tape is made of 20 wt. parts by weight of sodium phosphate * 6 wt. parts of cyanuric acid amide * 8 wt. parts of carboxymethyl cellulose * 12 wt. parts of pentaerythritol and 9 wt. parts of the blowing agent type Chemopr4-90. This loose mixture is mixed to 55 wt. parts of the chloroprene rubber manufactured under the brand Antikoropren 0 669'0. After perfect homogenization, the mixture can be applied to filter paper, preferably with a trowel * for the desired foaming thickness of 1.5 øт · After application, the finished film is heat-cured at 50 ° C for at least 6 hours and formatted onto the tapes as required ·

Example 2.

A sealable expandable film designed to protect the steel structure is prepared by combining 25 parts by weight of ammonium phosphate, 10 parts by weight of cyanuric acid amide, 10 parts by weight of starch and 12 parts by weight of pentaerythritol. 11 parts by weight of 1.1 azobia / formamide blowing agent are added. The mixture is mixed with 40 parts of 6626 Adhesive and impregnated with a 50 g / m ² veil glass mat. Consumption of mixture per 1 m ² is approx. 1000 g · Simultaneously with the same mixture it is impregnated on an aluminum foil screen with a weight of approx. 100 g / m ² and a mesh diameter of approx. 15 mm · After approx. 6 hours at 40 ° C the two layers are impregnated side-by-side, stretched between the pressure rollers or threaded, and the other side of the glass mat is impregnated in the same way · Total impregnation consumption is approx. 2,500 g / m ·

After drying in a drying cabinet at 40 ° C for at least 6 hours, the finished film is formatted as required on a scissor or lever.

Claims (1)

Sealing foil comprising 20 to 250 parts by weight of a rubber or polyvinyl acetate binder, 5 to 40 parts by weight of ammonium phosphate, 3 to 40 parts by weight of cyanuric acid amide, 5 to 30 parts by weight of starch, and / or carboxymethylcellulose. up to 40 parts by weight of pentaerythritol 5 to 50 parts by weight of a blowing agent, and at most 180 parts by weight of reinforcing fillers.