Flame Retardant Coating for Textiles

Abstract

Disclosed is a flame retardant coating for a textile sheet product, which contains at least one binder or a binder mixture, expandable graphite particles and additionally at least one chemical flame retardant. The grain size of at least 80%, preferably 100%, of the expandable graphite particles is at most 100 μm.

Claims

1. A flame retardant coating for a textile sheet product, wherein the flame retardant coating comprises at least one binder or a binder mixture, expandable graphite particles and at least one chemical flame retardant, wherein the grain size of at least 80% of the expandable graphite particles is at most 100 μm.

2. The flame retardant coating according to claim 1, wherein the grain size of at least 80% of the expandable graphite particles is at most 75 μm.

3. The flame retardant coating according to claim 1, wherein the at least one binder or binder mixture has a melting point or softening point in the range of 120 to 200° C.

4. The flame retardant coating according to claim 1, wherein the expandable graphite particles expand substantially only above a temperature of 200° C.

5. The flame retardant coating according to claim 1, wherein the at least one chemical flame retardant is selected from the group consisting of polyammonium phosphates, melamine cyanurates, aluminum hydroxide, magnesium hydroxide, antimony compounds, and combinations thereof.

6. The flame retardant coating according to claim 1, wherein the flame retardant comprises TABLE-US-00002 20 to 40 wt. % expandable graphite particles and/or 5 to 15 wt. % chemical flame retardant; and/or 30 to 40 wt. % binder or binder mixture.

7. A flame retardant textile sheet product comprising a textile backing layer, wherein a plurality of coating elements or a continuous coating element is arranged on the textile backing layer, wherein at least one coating element consists of the flame retardant coating according to claim 1.

8. The flame retardant textile sheet product according to claim 7, wherein the particle density of the expandable graphite particles is 10 to 500 particles/cm.sup.3.

9. The flame retardant textile sheet product according to claim 7, wherein the textile backing layer forms a first outer layer and wherein the flame retardant textile sheet product comprises a second outer layer, the second outer layer being a knitted fabric.

10. A method for producing a flame retardant textile sheet product containing a textile backing layer comprising the steps of: a) Preparation of a flame retardant paste comprising at least one binder or binder mixture, expandable graphite particles and at least one chemical flame retardant, wherein the grain size of at least 80% of the expandable graphite particles is at most 100 μm; b) Optional foaming of the flame retardant paste to form an unstable or stable foam; c) Application of the flame retardant paste by stencil printing or application of the unstable or stable foam by foam coating to the textile backing layer; and d) Drying.

11. The method according to claim 10, wherein in step c) a woven, knitted or nonwoven textile backing layer is coated.

12. The method according to claim 10, wherein in step c) the flame retardant coating is applied to the textile backing layer in an amount of 20 to 400 g/m.sup.2.

13. The method according to claim 10, wherein in step c) the flame retardant coating is applied with a layer thickness of 1 to 5 mm.

14. A flame retardant garment comprising at least one flame retardant textile sheet product according to claim 1.

15. The flame retardant coating according to claim 1, wherein grain size of 100% of the expandable graphite particles is at most 100 μm.

16. The flame retardant coating according to claim 1, wherein the grain size of at least 80% of the expandable graphite particles is at most 50 μm.

17. The flame retardant coating according to claim 1, wherein the at least one binder or binder mixture has a melting point or softening point in the range of 150 to 200° C.

18. The flame retardant textile sheet product according to claim 7, wherein the particle density of the expandable graphite particles is 50 to 300 particles/cm.sup.3.

19. The method for producing a flame retardant textile sheet product according to claim 10, wherein the grain size of 100% of the expandable graphite particles is at most 100 μm.

20. The method for producing a flame retardant textile sheet product according to claim 10, wherein the drying is conducted at a temperature of 80 to 100° C.

21. A flame retardant textile sheet product comprising a textile backing layer, wherein a plurality of coating elements or a continuous coating element is arranged on the textile backing layer, wherein at least one coating element comprises the flame retardant coating according to claim 1.

Description

EXAMPLES

[0066] The following example formulation for a flame retardant paste according to the invention is to be understood merely as representative embodiments and not as limiting the scope of the present invention. In addition to this formulation, various possible variations and modifications are apparent to those skilled in the art from the entire description, which also fall within the scope of the claims.

TABLE-US-00001 Weight % Component Example  35% Binder: Aliphatic polyester urethane dispersion, 50% solids content, Dicrylan PGS as well as aromatic or also polyether urethanes; alternatively, polyacrylate dispersions or other synthetic resin dispersions. Preferably as aqueous dispersions. 15% Foam stabilizer: preparation of ammonium and alkyl amine stearate Dicrylan stabilizer and special surfactants 7805  1% Pigment: Aqueous flame black dispersion  3% Crosslinker: Alkyl-modified melamine/formaldehyde derivative in Knittex CHN aqueous solution. Alternatively, dispersions of blocked or free isocyanates. 30% Expandable graphite: mean grain size < 75 μm. BLG40 Remacon 10% Chemical flame retardant: polyammonium phosphate and melamine- Textal FR-SB formaldehyde condensate ERBA

[0067] The above formulation is foamed to 140 g/l to form an unstable foam and applied to the textile at 1 mm gap height and 50 g/m.sup.2 coating overlay.

[0068] According to EN ISO 15025, in particular EN ISO 15025:2016, method A (surface flame treatment), the general combination of expandable graphite with a grain size of less than 100 μm and a chemical flame retardant present in the flame retardant coating, such as according to the embodiment example shown above, does not cause burning dripping, hole-formation, afterburning, afterglowing, melt dripping or continuous burning.