DE7027961U - PRESSED COMPOSITE. - Google Patents

Description

RH 35 79

_ SOCIETE RHODIACETA, Paris, France

Pressed composite

The present invention relates to a new molded composite.

From the French patent specification 1 502 654 a pressed one is already used Composite known, which consists of a textile fleece, preferably a non-woven fleece of the type called "spunbonded" (Spunbond), which is made of a * u synthetic, is preferably impregnated thermosetting polymers. Such a product has the advantage of being flexible at the same time and rigidity, but its formation is not entirely satisfactory. In particular, the products received are not sufficiently homogeneous, which is nac-h- -ceilig for their quality. In particular, their impact resistance and shock resistance for certain applications such as automobile bodies and certain household items that are widely used are unsatisfactory.

The present invention enables these products to be improved. It relates to a molded composite consisting of a resin of a synthetic polymer which by

at least one textile fleece is reinforced, which is made of practically endless organic threads with an oriented structure is formed, which at random in a non-parallel manner through the fleece "Are arranged, the composite also being characterized is that

1) any fleece with 0.01 to 5 wt .- # and preferably 0.3 to 0.8% by weight, based on the fleece, of a layer as a whole crosslinked organopolysiloxane is coated,

2) it may contain at least one material made of glass fibers.

Advantageously, the molded composites of the invention comprise a structure of textile nonwovens and fabrics made of textile glass fibers, in which a spunbonded nonwoven at least on the Outside of the composite appears.

The pressed composites of the present invention can be made by a process which consists in applying at least one nonwoven fabric formed from practically endless organic filaments of oriented structure randomly arranged in a non-parallel manner through the nonwoven fabric with the aid of a retarded polymerization resin to impregnate, assemble the impregnated fleece and bring the material obtained into the desired shape under conditions sufficient to bring about the polymerisation of the applied material, the fleece (s) made of organic threads prior to impregnation with the resin with a maximum of 5 $> and preferably with 0.3 to 0.8 $, based on the weight of the fleece, a ver. wettable organosiloxane is treated and then optionally dried and optionally the nonwoven fabric or nonwovens is or are composed of organic threads with at least one material made of glass fibers.

The term "fabric" used here means a fabric, a knitted fabric, a knitted fabric, an unwoven fleece, a lattice and the like. Which is formed from continuous threads or staple fibers.

• «■ •• ■ ι · ♦ · · ι» r

Every non-woven fleece, which is formed from organic filaments, is a fleece of the type called "spunbonded" (spunbonded fleece). Before the impregnation, this fleece can, if necessary, be treated decoratively, for example by dyeing or printing, and it can be obtained by embossing, embossing, scarring and the like show weak relief.

The above fleece is then with an aqueous dispersion or a Solution of a crosslinkable organosiloxane in an organic solvent at room temperature or impregnated with heat. The impregnation can be carried out by any known means, for example immersion in a bath, spraying on and the like.

After pressing and, if necessary, drying, the pre-impregnated one is impregnated Fleece and possibly one or more fabrics made of glass fibers with the resin made of synthetic polymer. The impregnated fleece are assembled and the whole is subjected to deformation under pressure, during which, at the same time, the polymerization of the resin takes place. This step can be carried out by a method known per se, such as, for example Cold pressing, hot pressing, molding and profiling, depending on the type of resin with delayed polymerization. Preferably is the resin used is an unsaturated polyester, but other resins are such as those in French patent 1,502,654 mentioned, not excluded. A particularly interesting type of resin is that of the resins used in the manufacture of prepreg Nonwovens called nonwovens are used. Such products polymerize only slowly after their use, which enables; light to store the pre-impregnated fleeces, which are thus ready for their shaping.

The pressed composites of the present invention have exceptionally good ones dynamometric properties have an impact resistance and impact resistance that are far from that of known products of this type are superior, due to a better homogeneity that is probably due to better contact between the nonwovens and the resin.

In addition, the pressed composites according to the invention have only fabrics on the basis of laminates. Fiberglass in addition to a lower density, much better impact strength and impact resistance. This affects in particular in a significant improvement in the resistance to peeling due to the splitting off of the resin that occurs after the impact, the end.

In addition, in the prior art of contact molding, it is necessary to apply a film to the mold before the actual laminated resin To apply a layer of generally reinforced pigmented resin a few mm thick, which is then gelled. That to be molded Material (layered resin and its reinforcement) is then applied to this layer and molded. This layer prevents that the reinforcement of the laminate rests against the surface of the mold. In the case of the composites according to the invention, is in use this technique eliminates the need to apply the first layer, which greatly simplifies the stratification process.

Finally, the preferred pressed composites of the present invention ensure the presence of a spunbonded web a better appearance near the surface of use when the surface is constantly exposed to friction.

The pressed composites of the invention are particularly useful for motor vehicle bodies and body parts, such as roofs, fenders, engine and trunk hoods, doors and dashboards, Household items, cover and cladding panels, furniture, especially seats such as chairs, armchairs, stools and the like., and plug-in bodies or their parts.

The invention is to be explained in more detail below on the basis of exemplary embodiments with reference to the figures of the drawing will. Show it:

Fig. 1 is a greatly enlarged schematic cross section of a invention ^ according to pressed composite,

Fig. 2 shows an upturned stool, part of which has been cut out is and

Pig. 3 a bulged roof for a motor vehicle, in which case a part is cut out.

In the? .N Fig. 1 shown greatly enlarged and very simplified Quernchnitt a pressed composite material of the invention are indicated by 1, the endless chemical fibers, with 2 of the silicone coating on these threads and with 3 the binding resin.

In the case of the stool shown in FIG. 2, the number 4 is spvnbonded Fleece and 3 denotes the resin binding this fleece. A A part designed in the same way can also serve as a furniture foot, for example.

In the roof shown in FIG. 3, 4 again denotes the spunbonded fleece and 3 denotes the resin that binds this fleece.

example 1

In an extruder with a screw is melted eir granules of polyethylene terephthalate having an intrinsic viscosity of 0.65, after drying (determined at 25 ⁰ C iu a solution of 0.5% in o-chlorophenol) having a moisture content below E ^ 0, # 01, through a pump by bringing the molten mass into a avf 290 ⁰ C heated spinneret having 45 holes of 0.9 mm diameter. The throughput of extruded material is set to 3.9 g / min and hole. The thread bundle is continuously collected in a drawing nozzle, which is located 175 cm from the spinneret, in such a way that the bundle cools on the way from the spinneret to the drawing nozzle. The drawing nozzle is fed with compressed air at 6 bar (pressure read on the manometer ).

After drawing, the threads have the following properties:

Average titer 6.7 dtex

Elongation 50 i »

Strength 32 RKM

By means of a vibrating guide plate, the bundle of oriented threads is placed on an endless conveyor belt, on which it forms an unwoven fleece, which consists of endless individual threads that are randomly arranged in ni-, i.-parallel veins. The fleece weighs about 280 g / m ^. V.di calibrated this fleece by passing it between two heated at 120 ⁰ C hindurc- rollers, whose spacing is set to 1.5 mm, continuously.

Subsequently, this leads spunbonded nonwoven in a needling machine, which is equipped with needles having nine beards and adjusted so that a stitch density of 75 stitches / cm and a dictated Γ is obtained ke mm of approximately 3 minutes. The fleece then weighs 300 g / m.

This nonwoven fabric is then treated by spraying with an aqueous dispersion containing 1 ia vinyl-tris- (methoxyethoxy) silane so that the percentage of dry matter, based on the nonwoven fabric, 0.5. After the fleece has dried, it is impregnated in a container which contains a solution of a resin based on polypropylene glycol phthalate and maleate in styrene. . such as methyl ethyl ketone peroxide as a catalyst in an amount of 1 wt .- #, based on the resin, and 0.1 wt .- # cobalt octoate, based on the same resin, as an accelerator, the two last-mentioned compounds being introduced in alcoholic solution . Excess treatment agent is then removed and dried.

Three identical fleeces obtained in this way are placed on top of one another, and the whole is placed between the die and male mold of a mold for holding electrical fittings and held for 2 hours at 20 ^° C. under a relative pressure of about 5 bar.

The final product, which is 60 cm in length, 30 cm in width and 3 mm in thickness, weighs 1460 g with the resin making up 70 $ by weight of the material.

Example 2

ke-a third A, as described in Example 1, "-woven" spunbonded fleece is printed with a pattern of yellow and white flowers on a red background of Provencal style by means of a printing paste which contains laser-dispersion paints ⁺ offe. After drying, the printed fleece is as in Example 1 by spraying: u ^Y u. 'the same. Silai. treated, impregnated with the same polyester resin and molded, but in a shape without a rim. A decorative panel 4 mm thick and weighing 1530 g / m 2 is obtained, the resin being about 80 $ of the total weight of the material.

Example 3

Between two calendered, needled and impregnated as in Example 1 Nonwoven fleeces are placed in a glass fiber mat with a weight of 450 g / m 2 under a relative pressure of about 5 bar in a mold for a rear left fender of a motor vehicle. The piece obtained weighs 3600 g / m, of which There is 2450 g of resin and its thickness is about 3 mm.

The same test is carried out starting from a fiberglass mat of 450 g / m and two nonwoven webs of polyester filaments by analogous the webs above with the exception that their weight 200 g / m, and the amount of resin 76 wt $> of the final meterial. An impact test is carried out on the substantially flat part of the finished part and on that of a laminate of the same thickness containing only a glass fiber mat of 450 g / m and resin, which consists in dropping steel balls of different weights from a given height to let and to compare the formed impression. It is found that the same impression is obtained on the two parts if a 2 kg ball is dropped on the glass fiber-based test piece and a 3 kg ball on the test piece according to the invention from a height of 1.50 m leaves. In this latter i'all, the impact strength is thus improved by 50 i » , which is a material for motor vehicle

body ^ * oa "is of particular value.
Example '

One stol ι ί - .1 cri »i oVion Δΐί · Ρν» αιι ιτ-ηκι VT S aoan uH ο -in Λ om χτΓ \ · ηΤτ \ αΎ * ιτα ₌

existing B ^ üpiel her, with one of the spunbonded fleeces in the in the same way as in Example 2 is printed on its outer surface. This structure is carried out under the same conditions as in Example 3 pressed, the shape being that of a plate. A decoration plate with good impact strength is obtained good resistance to peeling, especially the edges, Si.genscb for use in restaurants and for self-■ ' inung are particularly valuable.

Example 5

In a manner analogous to that described in Example 1, Fan uses a calendered and needled spunbonded web a weight of about 50 g / m. This fleece is made with the same silane as in Example 1 in an amount of 0.5 Ge; v .- # Treated dry material and impregnated with the same polyester resin.

After pressing 15 so impregnated and stacked i. Fleece under the same conditions gives a shaped piece with a thickness of 2.1 mm and a weight of 2700 g / m, of which the resin is 72.5% by weight.

Example 6

Arrange the following 5 layers on top of each other:

a) an impregnated spunbonded fleece as described in Example 1 is,

b) a fabric made of continuous glass threads with a weight of 320 g / m, jc) a fleece (a),

d) a fabric (b),
· 'E) a fleece (a).

* It »flit« 9f * »«

• · »ft ■ ·» I

t *> t * I S

»111 ·· ·« «ft

I * II * * f

The whole is molded for 1 1/2 hours at 70 ^° C. under a relative pressure of 5 bar. »

This gives a shaped laminate having a thickness of 38 Jim and a weight of 5000 g / m at a resin proportion of 69 / o by weight of the material.

Claims (2)

- 10 protection claims 1.Geer composite of synthetic polymer resin, that is reinforced with at least one textile fleece, carrion is formed from essentially endless organic filaments with oriented structure, which are arbitrarily in non-parallel Are arranged through the fleece, characterized in that each fleece with 0.01 Ms 5 wt .- #, based on the weight of the fleece, a layer of a / rewetted organopolysiloxane is coated and the composite material, if necessary contains at least one fabric made of glass fibers. 2. Pressed composite according to claim 1, characterized in that that each fleece with 0.5 to 0.8 wt .- #, based on the Weight of the fleece, coated with a layer of a crosslinked organopolysiloxane ict.