DE2251558A1 - LIGHT, NON-FLAMMABLE MATERIALS CONTAINING AN INNER LAYER OF REINFORCED GAZE - Google Patents

Description

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SG 3980

RHQNE-POULENC S.A., Paris / France

Lightweight, non-flammable materials containing an inner layer of reinforced gauze

The present invention relates to lightweight, self-extinguishing or non-flammable laminates that are produced by pyrolysis only generate very small and non-toxic amounts of smoke or gas and an inner layer of reinforced gauze and which are characterized in that the layer of reinforced Gauze on the adjacent layers with a binder resin from the group of organosilicon polymers, the polyimides, of polyamide-imides and polycondensates from D.iamin and unsaturated bis-imides is glued and that at least one outer layer of these laminates is a metal web.

Lightweight laminates are laminates whose Weight is below about 2800 g / m. For example, if the laminates have a thickness of 1 mm, it is in aviation prefers that their weight does not exaggerate about 1000 g / m.

09817/0889

There were numerous self-extinguishing or non-flammable Materials of an inorganic nature, such as asbestos, or various glass fabrics, or of an organic nature, such as Polyimides, polyamide-imides or silicones are used. The problem of gluing a layer of reinforced gauze to it However, neighboring layers presents difficulties when one at the same time wants to maintain the porosity of the reinforced gauze layer and its non-flammability.

The reinforced gauze used is itself made of a non-flammable material that does not generate smoke through pyrolysis. The preferred material is glass. The simple superimposition of warp threads and weft threads, however, offers no mechanical strength, which is why it is necessary to give the mesh a suitable impregnation treatment to reinforce. It is known to use phenolic resins for this purpose, but numerous other thermosetting resins can be used Resins are suitable, such as, for example, organosilicon resins or polyimide or polyamide-imide resins. Instead of glass you can other non-flammable tapes, such as tapes made of polyimides or polyamide-imides. In general, the diameter of the filaments forming the gauze is between 0.3 and 2 mm.

The binder resin used to bond the reinforced gauze layer to the adjacent layers should be used whenever possible Be non-flammable and preferably at the molding temperature of the laminate, which is generally between 140 and 190 ° C lies, does not flow.

Such binder resins can be found among the silicone resins and in particular among those in the French patent specification 1 568 812, consisting of groupings of the formulas

PhSiO _{1 K} , Me, SiO _{n Kf} Ph ₀ SiO, MeViSiO and (Me ₉ J ₀ SiO ι, 9.? Υ, ρ £ - cc.

exist, on average per silicon atom

KHJB 17/088 9

0.38 "to 0.44 vinyl groups Vi,
0.75 "to 0.96 phenyl groups Ph ^- and 1.94" to 1.99 groups Ph, Vi and Me and 10 groupings each

PhSiO, _c
1 »5

5 "to 9 groupings Me ^ SiO _n ^

25 to 50 groups Ph ₃ SiO
30 to 50 groups MeViSiO and 2 to 12 groups Me ₂ SiO

contain, the crosslinking of these silicone resins usually takes place in the heat in the presence of organic peroxides.

One can use the French one for the same purposes Resins described in patent specification 1,555,564 based on Use polycondensates of bis-imides and diarains. These resins are made by reacting an N, IT'-3is-imide to an unsaturated Carboxylic acid of the general formula

• CO. ^ ⁰⁰ V.

D ^ N-A-N ^ I)

in the D a divalent radical, which is a carbon-carbon -Double bond, means and A represents a divalent radical having at least two carbon atoms, with one biprimary diamine of the general formula HpN-B-WHp, in which B represents a divalent group having not more than 30 carbon atoms. In general, it is preferred to use the To use bis-maleiniinide.

Polyimide resins, such as those in the French patent 1 365 54 5 described, odor PoH y, 'inn ri-irnid resins made by Trirnell ΰ UuuiurpanliyrirJd otairmion,

'^ 19817/0809

use.

The laminates according to the invention also have at least an outer layer consisting of a thin metal sheet (less than 40 microns, generally 10 to 30 microns) ordered. The metal of this track can be aluminum, stainless steel, copper, titanium, or an alloy of these metals. In general, one attaches the metal sheet to the neighboring one Schiclit using a known adhesive on the base of alkali silicates or organic orthosilicates or organosilicon adhesives. The metal web is preferably not glued directly onto the layer of curtained gauze, but rather on it another intermediate layer, such as asbestos or glass fabric. The metal track is on the outside of the laminate s arranged. A BaIm or a glass fabric can also be attached to the other side.

The laminates according to the invention are in particular for Inner lining of plug stuff, especially plug stuff ceilings, usable. The purpose of the metal layer is to reflect the light sources used on board the plug tools and to sprinkle.

The following examples serve to further illustrate the invention.

example 1

To make a laminate one uses one from two steel sheets with a thickness of 5 mm existing form. A film with a thickness of 50 microns made of polyethylene glycol terephthalate is applied to the lower sheet. To this Polyeoter foil one brings an aluminum strand with a thickness from 15 microns on, axif which is a white ghryeolite asbestos paper is glued on with a thickness of 0.3 mm using alkali silicates in an amount of 40 g / m 2. The weight of the aluminum-chrysolite composite is? 80 g / m. This material,

3 0 9 8 17/0839 _8AD ORIGINAL

is then immersed in a thin layer of Vinyltris ~ (methoxyethoxy) silane coated. The chrysolite that is on the upper side, is then with a brush with a previously heated to 70 ° C fluid polysiloxane resin a content of 1.5 wt. ^ Dicumyl peroxide and a viscosity of 10800 cSt at 20 G, which consists of groups CgHp-SiO. ^,

CH ₅ (CH ₂ -CH) SiO, (CH ₅ ) ₂ SiO and (CH

exists in molar ratios of 10/35/40/8/7, impregnated. The impregnation is canceled when the entire surface of the Ghrysolithasbests is uniformly wetted. The amount of polysiloxane resin used is then 80 g / m 2.

A glass gauze reinforced with a phenolic resin is applied to this first strip, the whole thing being done with vinyltris- (methoxyethoxy) -silane had been treated. This gauze weighs 415 g / m, of which 75 g / m phenolic resin, with a thickness of 0.5 mm. the Warp and weft threads are 3 mm apart. The phenolic resin is a common commercial phenol-formaldehyde resin. The gauze is strengthened by impregnating it in an alcoholic solution of the phenolic resin and. subsequent networking the fixed resin by heating it in an oven. ι

A glass popel fabric with a thickness of 0.08 mm and a weight of 90 g / m is placed on the preceding strips, coated with vinyl tris (methoxyethoxy) silane and then was impregnated with the polysiloxane resin already described under the same conditions as for the chrysolite asbestos, on. The polysiloxane resin is used in an amount of 28 g / m used. ■

A film of 50 micron thickness made of the polyester already used and then the second sheet of steel, which serves as the lid of the mold and is equipped with 0.9 mm spacers, is placed on the preceding strips. · ' : ■■■■> -

:, 0 9 3 17/0889

The mold is placed in a press for 1/2 hour at 150 ^° C. under 15 kg / cm. It takes the form of heat from the press, leaving it for 6 hours in an oven at 200 ⁰ C. The mixture is allowed to cool down to 15O ⁰ C and then en.tformt.

The laminate obtained weighs 900 g / m 2 for a thickness of 0.9 mm. Its flexural strength is 4.1 kg / mm ". This Laminate is therefore particularly suitable for lining the ceilings or cargo spaces of plug-in vehicles. The one with aluminum covered side of the laminate is glossy and serves as a Reflector distributor for the fluorescent tubes used on board the plug-in items, which are covered by opaque plastic light distributors are.

Example 2

A laminate is made according to the method of Bei * - game 1, but with the following layers:

A sheet of aluminum 15 microns thick, glued to an asbestos

paper 0.3 mm thick, weight 280 g / m, with the whole with Vinyltris- (methoxyethoxy) -silane coated and then with the the same polysiloxane resin was impregnated in an amount of 100 g / m 2 and the aluminum alkali silicates was received,

2 and with the aluminum-asbestos compound with 40 g / m

a reinforced G-aze identical to that of Example 1,

a symmetrically arranged third layer, the is identical to the first, i.e. that the asbestos side impregnated with polysiloxane resin faces the reinforced gauze is.

After pressing, demolding and reheating, the laminate obtained has a thickness of 1.2 mm, weighs 1200 g / m and

has a flexural strength of 3.9 kg / mm.

30 9817/0889

example

A laminate is made according to the method of Example 1, but with the following layer sequence:

A sheet of aluminum 15 microns thick, the inner surface of which degreased beforehand with Trichloräthyl.en and then with a brush with a methanolic solution of ethyl orthosilicate and Ieopropyltitanat (75 parts by weight of methanol, 15 parts by weight of ethyl orthosilicate and 10 parts by weight of isopropyl titanate) which is left to dry for 1/2 hour. the

treated web weighs 40 g / m;

a .Glasspopelnewebe with a thickness of 0.08 mm and a

ρ
Weight of 90 g / m with that used in Example 1

Polysiloxane resin is impregnated in an amount of 25 g / m 2

a fiberglass gauze with a thickness of 0.5 mm and a tube
weight of 3 ^ 0 g / m, at which the warp and weft threads

Have a distance of 5 mm and the gauze with the same as in Example 1

polysiloxane resin used is amplified in an amount of 100 g / m, wherein the impregnated fabric impregnated 1/2 hour in the oven at 150 ⁰ C and was then post-heated in an oven at 200 ⁰ C.

A glass popel fabric identical to the previous one and finished in the same way.

The laminate shows after pressing, reheating and demolding has the following properties:

Weight: 700 g / m ²

final thickness: 0.8 mm

Flexural strength: 4 kg / mm

3098 17/088

Bel r> piel A

tti'.n makes an ochichtotof f by stacking stape In the following beans:

a) An aluminum tubing with a thickness of 15 microns which is simply degreased with chlorinated ethylene,

b) a glass popcl in fabric with a weight of 90 g / m "and a thickness of 0.08 mm, djer.ee. Time with 82 g one Prepolymer is impregnated by immersion in a solution of the following composition:

Prepolymer made by heating for 1 hour 15 parts of N, N-4,4'-diphenylinethane-bis-maleimide with 8,? 9 g BiR- (4-aminophenyl) methane at 1? 0 ° C ... 45 parts

N-methylpyrrolidone 38.5 parts

Xylene 16.5 parts

after which the Lönun / Tßmi ttel are evaporated by passing them into a ventilated oven heated ^{to 160 0 C,}

c) a goze made of glass fibers with a thickness of 0.5 mm, which is identical to that of example 3 in the raw state, but reinforced ^{by impregnation with the prepolymer solution described under b) and subsequent heating in the oven at 180 ° C. for 1 hour} is; that is how they are impregnated

Gauze with an amount of resin of 120 g / m,

d) a glass popel fabric which is identical to fabric b) and is treated in the same way.

The pressing takes place under a pressure of 30 kg / cm with a temperature rise from 100 to 180 C within 30 minutes, after which 1 hour at

" ^9: ' ^! '^;'' ^I} "^{; ll} ' ^{: i} . SAD ORIGINAL

is kept at 180 ° C. The operation is ended a fan heating of the laminate for 24 hours 250 C in a ventilated oven »

The properties of the laminate are as follows:

Weight: Thickness: Flexural Strength:

820 g / m ² 0.9 mm 6 kg / mm

Claims (3)

Claims 1. Light self-extinguishing or non-flammable laminates that are very low and non-toxic due to pyrolysis Generate amounts of smoke and gas and contain an inner layer of reinforced gauze, characterized by that the layer of reinforced gauze to the adjacent layers by a binder resin from the group the organosilicon polymers, the polyimides, the polyamide-imides and the polycondensates of diamines and unsaturates Bis-imiden is glued and that at least one outer layer this laminate is a metal sheet. 2. Laminates according to claim 1, characterized in that the binder resin used is at the molding temperature of the laminate does not flow. 3. Use of the laminates according to claim 1 for interior lining of aircraft. '/ ■