Composite material for protective clothing

 

(57) Abstract:

The invention relates to PPE, in particular materials for the manufacture of protective clothing from simultaneous exposure to aggressive chemicals and high temperatures. The material includes an inner layer made of fiberglass impregnated with a solution of heat-resistant rubber. The outer layer of material made of polyimide or polyethylene terephthalate film with a spray heat reflective layer of aluminum and attached to the inner layer with a layer of heat-resistant rubber adhesive. The intermediate layer is made of aluminum or steel foil, attached to the outer layer with a layer of heat-resistant rubber adhesive. The material has a high degree of protection from the intense thermal effects and aggressive substances, heat-reflecting ability, mechanical strength, provides high reliability of protective clothing made from this material. table 1.

The invention relates to PPE, in particular to the materials intended for the manufacture of protective clothing from simultaneous exposure to corrosive substances, high temperatures and flame.404 In 43/00, And 62 In 17/00, 1978).

Known material does not provide protection against aggressive substances.

Known composite material, designed to protect against chemicals and high temperatures and flame. The material contains a basis of tissue-type "Nomex" or "Tyvek" covered sequentially gas-tight polymer and heat-reflecting metallic films, the material on the front side has a polymer coating, made of thin plastic film (U.S. patent 4792480, MKI432 In 27/00, 1988).

In the known material is taken as the base fabric "Nomex", "Tyvek" have low heat resistance, which reduces the reliability of the material.

Known material has a low degree of reliability due to covering the outside of a thermoplastic plastic film having high fluidity (film starts to break down at a temperature of 50oC). When in contact with high temperatures and open flame film melts, resulting in the surface of the material formed nodules and bare places that reduces heat-reflecting sposobnosti action. In addition, the resulting hot drops of polymer coating can cause burns as working in protective clothing made of a known material and staff, assisting in the removal of protective clothing.

Known composite material, selected as a prototype, designed to protect against chemicals and high temperatures and flame (patent of Ukraine And 21076, MKI632 In 27/00, 1997).

The material includes an inner layer made of fiberglass impregnated with a solution of a heat-resistant polymer, and an outer layer made of polyimide gas-tight film deposited on the inner side of the heat-reflecting layer of aluminum.

The disadvantage of this material is insufficient mechanical strength, particularly low resistance to tearing, punctures and cuts, and fast enough violation of the integrity of the front cover in contact with an open flame. In addition, the use of known heat-reflecting material layer beneath the film, contributes to the gradual accumulation of heat in the film when exposed to thermal radiation, high-intensity ZAR> In the inventive composite material for protective clothing containing inner layer, made of fiberglass impregnated with a solution of heat-resistant rubber, the outer layer made of gas-tight film sprayed with heat-reflecting aluminium layer and the prisoner between them a layer of heat-resistant glue, in contrast to the prototype as a gas-tight film it contains polyimide or polyethylene terephthalate film, a heat-reflecting aluminium layer is located on the outer side of the gas-tight film and further comprises an intermediate layer made of aluminum or steel foil and attached to the gas-tight film layer of heat-resistant rubber adhesive.

The objective of the proposed technical solution is the creation of a more reliable composite material for protective clothing against the simultaneous influence of aggressive media, high temperatures and flame.

Use in the composite material as a gas-tight polymer film or polyethylene terephthalate film material provides high thermal stability and resistance to aggressive substances. Polyimide and polyethylene terephthalate square the solvents, thermal stability of the used film high (thermal degradation of polyimide film is 450oWith pet - 320o(C) that allows to operate special protective clothing made of the proposed composite material, in terms of simultaneous exposure to high temperatures and corrosive substances.

The location of the heat-reflecting the deposited layer of aluminum on the outer side of the gas-tight film provides compared to prototype a higher degree of reflection of heat (up to 95%), which prevents the preliminary heating of the material due to the impact of thermal radiation of high intensity, up to intermittent contact with hot surfaces of objects or open flame, which increases the reliability of a composite material.

The presence of the proposed technical solution, optionally an intermediate layer of aluminum or steel foil, attached to the gas-tight film layer of heat-resistant glue, significantly improves the mechanical strength of the material, and consequently, the reliability of a composite material. In addition, the use of an intermediate layer of aluminum is positive, the reliability of a composite material. Thus, during operation in the conditions of intensive heat radiation, high temperatures and open flame may deteriorate the film with a deposited layer of aluminum, while the presence of aluminum or steel foil (the melting point of steel foil is 1100oWith that aluminum is 660oC) will help to preserve the integrity of the composite material and its protective properties over a period of time and consequently increasing the reliability of a composite material.

In the manufacture of the material initially producing deposition of aluminum on polyimide or polyethylene terephthalate film, and then the surface film applied heat-resistant glue and tape duplicate using calenders aluminum or steel foil.

Fiberglass pre-impregnated with a solution of heat-resistant rubber (for example, silicone or nitrile) and dried. Then on the surface of the fiberglass applied heat-resistant adhesive and produce accession film, laminated foil. To simplify manufacturing techniques of composite material heat-resistant glue for duplicating film and attach stenlid rubber.

Performance of the proposed composite material must meet the requirements of fire safety norms NPB 161-97 "Special protective clothing fire from elevated thermal effects. General technical requirements. Test methods". The table below shows the main performance indicators of the protective material according to NPB 161-97 and the proposed composite material depending on the use of specific materials for each layer. In each series of examples (1, 2, 3, 4) as a gas-tight film with deposited aluminum was used alternately heat-resistant polyimide and polyethylene terephthalate film, but used one of the types of heat-resistant rubber and glue on its basis (examples 1, 2 - polyacrylate SKT, SKT, examples 3, 4 - nitrile SKN). From the values of the indications of the table shows that in examples where used alternately polyimide and polyethylene terephthalate film, but one kind of heat-resistant rubber and glue on its basis, the difference in the values of operational parameters of the materials is insignificant and all materials comply with the requirements of NPB 161-97. From the comparison of the values of reading materials in the case of IP is eaten thermal degradation (silicone SKT, SKT - 450oWith, nitrile SKN - 430oC) and glues based on them (examples 1, 3 and examples 2, 4), it follows that the difference in the values of indices of the materials are also insignificant and materials complying with the requirements of NPB 161-97. The results of the testing materials for the manufacture of which was used as intermediate layers of steel and aluminum foil, but is the same film, rubber and glue on its basis, show that when used steel foil (examples 5 and 6), the performance values are higher compared with examples 2 and 4, which use aluminum foil. Material that uses steel foil, can be recommended for the manufacture of protective clothing, heavy type, which is intended for protection from the intense thermal radiation in areas of high temperatures (up to 1200oC). The disadvantage is its high cost compared to the material in which aluminum foil, and a shortage of steel foil in the domestic market.

The inventive composite material has high heat resistance, heat-reflecting ability, mechanical strength, increases the protective effect S="ptx2">

Composite material for protective clothing containing inner layer, made of fiberglass impregnated with a solution of heat-resistant rubber, the outer layer made of gas-tight film sprayed with heat-reflecting aluminium layer and the prisoner between them a layer of heat-resistant rubber adhesive, characterized in that as the gas-tight film it contains polyimide or polyethylene terephthalate film, a heat-reflecting aluminium layer is located on the outer side of the gas-tight film and further comprises an intermediate layer made of aluminum or steel foil and attached to the gas-tight film layer of heat-resistant rubber adhesive.

 

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