POLYMERIC FLAME RETARDANT FOR TEXTILE FINISHING

Transcription

1 P+ POLYMERIC FLAME RETARDANT FOR TEXTILE FINISHING

2 SYSTEM DESCRIPTION AND ADVANTAGES P+ is a wash durable water-based brominated acrylate copolymer, combined with an additive which provides solutions for flame and smoldering suppression, when wash durable FR coating and backcoating formulations are required. P+ complements the general purpose P, to efficiently cover the full range of coating application from 100% polyester fabrics to 100% cotton fabrics and any combination in between. P+ has the following properties: Chemically bound bromine within an acrylic copolymer dispersion. Inherent FR properties. Flexible film forming. Effective smoldering suppression in cellulosic fabrics. Enables significant reduction of bromine and antimony trioxide (ATO) and opens up the possibility of ATO free formulations. Self binding; no additional binder needed Excellent transparency Easy incorporation in pigment printing systems Compatibility with most textile finishing chemicals Good ph stability Supplied as an aqueous dispersion with up to 50% solids Ability to achieve FR cotton/polyester fabrics durable up to 50 laundry cycles 2

3 Sustainability and Durability These unique properties of P+ make it an environmentally acceptable, fully polymerized, non-leaching bromine system. The homogenous system enables long shelf life and easy product management. Additionally, the flexible system opens new opportunities for uncomplicated water based FR treatment of 100% cotton and synthetic blend fabrics. Flexibility One of the most important benefits of using P+ is a consequence of its acrylate structure. Like most water borne acrylates/latexes, it is easy to handle and dilute and may be adjusted for different foaming, hydrophobic/hydrophilic, adhesion properties, etc. P+ may be used in various application techniques including spray, pad, print, coat, foam and brush. P+ is highly compatible with most common textile formulation additives such as: cross-linkers, softeners, antimony trioxide, pigment dispersions, etc. P+ enables use of significantly reduced amounts of bromine and antimony trioxide synergist on fabric for achieving satisfactory flame retardation, thus providing a cost efficient FR solution. 3

4 PROPERTIES The main properties of P+ are summarized below. It is suitable for durable textile coating applications, especially to pass stringent standards such as BS-5852, NFPA-701 and 16 CFR Properties of P+ Dispersion P+ Weight% Br 16 Solids 50 ph 4-6 Viscosity* Appearance * further viscosity adjustment is possible cps Milky suspension P+ copolymers should be handled in a similar manner to acrylic emulsions, e.g. protected from freezing and stored in airtight containers. APPLICATION EXAMPLES P+ can be formulated as follows. A typical deca based coating formulation is given for comparison. 4

5 P+ Backcoating Formulation Compared to Typical Deca Formulation P+ **Dry weight% Deca Dry weight% Total Dry solids FR ATO 3.5 (1:6)* 13.7 (1:3)* Acrylic binder solids NONE 10.5 Dispersing agents Miscellaneous (thickener + antifoam + softener etc.) * Sb:Br Molar ratio: A 50% reduction for P+ compared to traditional FR s. ** Note: products are supplied as water based dispersions. Dry weight percentages are given for comparison to traditional FR s. The various dispersions are prepared by the following procedure: 1. Calculate the amount of water needed, in addition to the water already present in the P+ dispersion as supplied, to achieve the desired final dilution (solids content) in the coating formulation % of the water required for the final dilution in the formulation plus a dispersing agent are added to pre-stirred P+ dispersion. If desired, antimony oxide is then added slowly with stirring. The resulting mixture is stirred with a mixer (500 rpm) for 15 minutes. 3. Slow addition of the rest of the water and ph correction if desired. 4. Addition of other additives as desired, (such as thickener, pigments, etc.) to complete the latex formulation. The viscosity is adjusted to the higher range for fabric backcoating by common thickeners used in the industry. P+ add-on required is directly related to the properties of the fabric treated, for example: Fabric composition and construction Specific area weight/thickness Fabric end-use Flammability test required to pass Hand of fabric 5

6 EXAMPLE OF A BACKCOATING APPLICATION A 6 oz/yd 2 (190gr/m 2 ) 50/50 Cotton/Polyester upholstery fabric was used for the application example below. Results for Fabrics Backcoated with P+ Formulation Weight% on Fabric Total add-on 24.2 P Bromine 6.6 ATO 2.0** Flammability results of Treated Fabric Flame Retardancy* After Flame: After Glow: Char Length: 0 seconds 5 seconds 6.5 inches Results for Fabrics Backcoated with Deca Formulation Weight% on Fabric Total add-on 27.0 Deca 12.7 Bromine 10.7 ATO 6.4 Flammability results of Treated Fabric Flame Retardancy* After Flame: After Glow: Char Length: 1 seconds 55 seconds 6.3 inches * ASTM D vertical flame, 12 seconds ignition. ** Due to reduced 1:6 ratio required with P+ 6

7 EXAMPLE OF A PADDING APPLICATION The main properties of the fabrics used for this example are given below. Fabric Properties End-Use Composition weight% Weight oz/yd2 Construction Bedding 50/50 cotton/polyester 4.5 woven Apparel 100% cotton 4.2 woven Note the reduced amounts of Br and ATO required for the below. P+ formulation Results for Padded Fabrics 50/50 cotton/polyester weight% on fabric P+ P 100% cotton weight% on fabric P+ Dry solids Bromine NONE NONE NONE 1:6 1:3 1:6 Acrylic binder solids ATO ratio Flammability Results of Treated Fabrics after Twenty Wash Cycles ASTM D AF: AG: CL: 0 sec. 2 sec. 5 in. AF: 1 sec. AG: 12 sec. CL: 6 in. AF: 0 sec. AG: 2 sec. CL: 5 in. 7

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