DE1619210C - - Google Patents

Description

3 4 ■.

Polyvinyl chloride foamed synthetic leather by applying suitable propellants, which have a decomposition gene of two different layers of polyvinyl temperature below 150 ° C, are organic Chloride paste without intermediate heating on a poly-azo, hydrazo, nitroso and azide compounds, Vinyl chloride-repellent backing, for example N, N'-Dinitroso-N, N'-dimethylterephthaleiiier Textile overlay, subsequent heating and 5 amide, benzene-l, 3-disulfohydrazide and in particular The paste gels and finally the "diphenylsulfone-3,3'-disulfohydrazide" is removed. cooled artificial leather from the support. The propellants used should therefore be different

This object is achieved in that at below the gelling temperature of the polyvinyl chloride such method as that on the polyvinyl 'paste decompose. . -. · «■ -, .-

chloride-repellent backing pad to be applied 10 Organic propellants are therefore unsuitable two different layers of polyvinyl with a decomposition temperature over 150 ° C, dichloride paste first a polyvinyl chloride paste, for example azodicarbonamide, which is known to carries closed-cell polyvinyl chloride foams with a plasticizer content of 30 to 45 lead weight percent and a propellant content of 0.2.

up to 2.0 percent by weight of a propellant which breaks down below 150 ° C. The process is carried out in the following way and then leads to this: On a polyvinyl chloride-repellent carrier liquid paste layer, a further layer of a poly underlay, for example a carrier paper or vinyl chloride paste, is applied with a plasticizer gergewebe or optionally a entspregehalt of 40 to 50 percent by weight -and an accordingly pretreated metal substrate, the top-blowing agent content of 1.0 to 5.0 weight percent of the 20 coat paste using a doctor blade or by means of located at 150 ⁰ C. decomposing propellant, being applied reverse roll coater. Directly to the weight percent in each case on the sum of poly- closing is related to this still liquid polyvinylvinyl chloride and plasticizer, the additive paste with the help of a squeegee the second layer, next applied paste a higher viscosity consisting of the foam layer paste, is painted on than the then subsequently applied paste 35. These two liquid paste layers are applied and the paste applied as the second layer has a more tightly closed fabric, knitted fabric or fleece, and is foaming than the paste applied initially. The pre-treated laminate is continuously

Despite the open pores of the foam obtained, a hot air duct is fed into which the artificial leather this is waterproof and breathable. lation and expansion of the pastes to open-pore It was not expected to be done using the 30 foams.

Wet-on-wet method a waterproof and breathable? . The hot air duct has an active artificial leather would generally obtained, rather, was temperature of 150 to 200 ° C, in particular expect that heated because of the open-pored outer layer 170 to 180 ⁰ C, and can be prepared by hot air, this would not be waterproof. will.

The polyvinyl used as the top coat paste. After the resulting foamed synthetic chloride paste has cooled down generally has the following combination, this is removed from the carrier base, composition: The carrier base can, if necessary, be

55 to 70 'parts by weight of polyvinyl chloride powder, colored, so that a subsequent

45 to 30 parts by weight plasticizer, Prague process removal. ....... . -

0.2 to 2.0 parts by weight below 150 ° C * » ^Dl f, ^{according to the} method of operation, heart-replacing propellants

0.1 to 10 parts by weight of fillers, dyes deist a water pressure of 150 to 250 mm

and stabilizers. S ^ ¹⁶ , *? V ^ T, ^L u ^ftdu rchlassigkeit \ ^on ^ a

7000 l / min. / M ² at 0.1 atm. Or an air outlet

The proportion of propellant in the top coat paste 45 fluid of about 14,000 to 20,000 l / min. / M ² is accordingly from 0.2 to 2.0 percent by weight, 0.5 atmospheres, measured based on DIN 53 868. based on the Sum of polyvinyl chloride and _,. . .

Plasticizers. - Example

The so-called foam layer used as the second layer is a grained, polyvinyl-repellent carrier layer paste generally has the following composite paper, polishing is carried out with the help of a roller doctor blade: - vinyl chloride paste of the following composition

50 to 60 parts by weight of polyvinyl chloride powder, carried:

50 to 40 parts by weight of plasticizer, 59.8 parts by weight of powdered polyvinyl chloride,

1 to 5 parts by weight of a propellant with 31.6 parts by weight of plasticizer mixture,

a decomposition temperature below ⁵⁵ 1.0 part by weight of stabilizer, '

15O ⁰ C, 811 parts by weight of fillers and dyes,

0.5 to 5.0 parts by weight of stabilizers, fillers, 0.5 parts by weight of propellants.

and / or dyes. The layer thickness is 0.15 mm. Then the proportion of the blowing agent in the Schaumlage- 60 ™ ^RD by means of a downstream rolling squeegee paste is accordingly 1 to 5 weight percent sawn ^eme Polyvinylchlordpaste the following composition subjected to the sum of polyvinyl chloride and reduction ·, .. ·, "·, ■ _U i -j plasticizers. 57.0 weight point polyvinyl chloride,

The first so-called top coat paste is ^{plasticizer in the all- 49} $ weight place,

generally in a thickness of 0.05 to 0.2 mm, in particular 65 M parts by weight of filler,

special from 0.1 to 0.2 mm, applied; the second weight is a stabilizer,

Foam paste in a thickness of ofl to 0.5 mm, ² > ° parts by weight of propellant

in particular from 0.1 to 0.3 mm. on the first applied, still liquid paste of the

art applied so that the two pastes do not mix with each other.

The layer thickness is about 0.25 mm.

On the last applied paste layer (foam layer) a 150 g / m ² heavy tricot fabric is continuously placed with the help of a spreader and without the use of a thimble. The backing paper with the two paste layers and the tricot fabric is fed through a 15 m long gelling channel divided into three zones at a speed of 5 m / min

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performed with a horizontal hot air guide (hot air temperature of 175 to 18O ⁰ C), said gel the paste layers and expand and be connected to the tricot fabric adherent. After cooling, the backing paper is separated from the grained artificial leather.

The polyvinyl chloride foam synthetic leather has an air permeability of -about 20100 l / min. / M ² at 0.5 atmospheres and. a water resistance of 120 to 185 mm WS. ' ^: '

Claims (1)

1 2 because there are no or only patent claims between the cover and intermediate layers: few corresponding open cells are present are. 'Method for producing a waterproof, In a further known method are in · 'Breathable polyvinyl chloride foam art- 5 a Strerchanlage with two leathers connected in series by applying two different th squeegees according to the above-described re-layering of polyvinyl chloride paste without an intermediate process, two polyvinyl chloride pastes wet in wet heat and layered on a polyvinychloridabwei- one on top of the other. The carrier underlay sent according to this process, the application of an artificial leather made of textile, contains, however, a layer, subsequent heating and gelatinization of a paste containing blowing agent ten artificial leather 'von-' der .Trägerunterlage, da-. Textilberichte [1963], p. 393 and 394).
characterized in that as the -It is also known, porous, flexible sheet-like structures coated with plastic on the polyvinyl chloride-repellent carrier sub-coated in such a way that two different 15 len to be applied to the coating masses, water and acid layers of PVG paste initially one Poly- or alkali-soluble fillers are added, the vinyl chloride paste applies with a soft- after the application and film formation, the Bemacher content of 30 to 45 percent by weight and layering mass through an aftertreatment with a propellant content of 0.2 to 2.0 weight- water, diluted alkalis or acids again a percentage of each other - under. 150 ° C decomposing ao triggered and washed out. The porosity of the propellant and then on top of this liquid and gas permeability of the applied layer of paste layer "another layer of a poly- are of the amount, type, shape and size of the soluble vinyl chloride paste applied with a soft filler and the layer thickness of the lead content of 40 to 50 weight percent, and slow-dependent. Such coatings produced a blowing agent content of 1.0 to 5.0 weight 25 have, inter alia, the disadvantage that with increasingly. percent of the decomposing below 150 ⁰ C fuels mender porosity and gas permeability also. by , the percent by weight increasing in each case to the water permeability, which for many uses of polyvinyl chloride and plasticizers are used for purposes of preparation, for example for rainwear, the paste initially applied to shoe outer fabrics, etc., is undesirable.
30 Furthermore, methods for producing air-sealed paste and the paste applied as a second and water-vapor-permeable, flexible surface layer is more foaming than formed, in which the carrier materials have the paste applied initially. such as fabrics, knitted fabrics, papers, fleeces, etc. with a . . . ·. '' aqueous polyvinyl chloride dispersion are coated . 35 den, which in addition to plasticizers, stabilizers, fillers materials, pigments also a non-pasteable polyvinyl chloride, for example manufactured according to the Suspension polymerization process, in a grain Contains for the production of polyvinyl chloride foam sizes from 0.05 to 0.35 mm (German artificial leather various methods are known. 40 legend 1045 359). So you can use direct coating on a textile. Quantity and grain size of the added polyvinyl carrier a propellant-containing polyvinyl chloride paste chloride powder determine the porosity of the coating, which then gels and ■ expands. This method has the disadvantage that the is diert, whereupon, after cooling, a film of the coating compound is formed in two working steps Layer of a propellant-containing paste 45 must be done, in the first stage with applies, which gels in the same way and about 90 to 120 ° C evaporates the dispersion water is expanded. and in the second stage the gelation of the polyvinyl Such artificial leathers are not breathable, i.e. chloride is made at 150 to 180 ° C,
not permeable to air and water vapor, although both Another disadvantage of using this method Layers are open-pored because the pores of the breathable synthetic leather produced under 50 are small layer does not correspond to that of the upper layer. 'Water resistance, caused by the relatively coarse and both foam layers with a thin, porous structure of the coating. - Already under one , closed gelatinous skin are coated. Overpressure from 80 to 100 mm WS (based on It is also known that in the so-called reverse process, the water bubbles through the coating process, also known as the CC process, polyvinyl chloride 55, while the air permeability is only produced by foam synthetic leather, with a poly- 1800 l / min. / m ² at 0.5 atmospheres,
vinyl chloride repellent carrier, e.g. B. Paper, a process according to the state of the art Propellant-containing polyvinyl chloride top coat paste is therefore not kept sufficiently breathable with a thickness of about 100 to 200 g / m ² when coated, artificial leather with polyvinyl chloride coatings. In the case of subsequently pre-gelled and, in a further process, the so-called CC process, the blowing agent-containing paste for the central two open-pored layers is no or only a small layer applied between the steps, and the textile overlay and corresponding open cells are present on this. In which, for example, a tricot fabric is applied. According to known wet-on-wet processes, neither gelation, expansion and cooling are achieved, since only one layer of synthetic leather is lifted from the wearer (German foam layer is present, which is from a blowing agent-Auslegeschrift 1063112). Even so, both foam-free layers are covered. layers (cover and intermediate layer) are open-pored, the object of the invention is a method for producing the obtained foam synthetic leather is not breathable, position a breathable and waterproof