Fire Properties Improvement of an Ultra-low. Density Fiberboard

Transcription

1 The 57th International Convention of SWST, June 23-27, Zvolen, SLOVAKIA Fire Properties Improvement of an Ultra-low Density Fiberboard Min Niu, Olle Hagman, Alice Wang, Yonqun Xie (Luleå University of Technology in Sweden)

2 Building energy consumption Insulation materials Non insulated house Reduce energy consumption

3 Insulation materials Foam Blanket or Panel Blanket or Batts

4 Ultra-low density fiberboard Application Insulation material, buffering material Ingredient plant fiber (Max 80%wt), surfactant, adhesive and additives (Recycled) Plant fiber the matrix Additives the filler

5 Ultra-low density fiberboard Raw material source News paper Carton box Paper pulp Kenaf bark Bamboo Straw Preparation method Mechanical foaming approach Heat press, adhesive, formaldehyde emission

6 Ultra-low density fiberboard Characteristics Network, open holes inside Ultra-low density of kg/m 3 Low thermal conductivity of W/mK High sound absorption coefficient of 0.67 Problem Low fire properties

7 Fire resistance treatment Liu (2013, Doctoral dissertation) Silicon compound Chlorinated paraffin Aluminum sulfate Research Differences Si-Al compounds the filler Plant fiber the matrix Little literature about fire properties of ULDF

8 Objective To make clear Si-Al compounds how to improve fire properties Increasing its amount Observing its microscopic distribution in this material

9 Materials Newspaper (NP, collected in China) Fiber length 1047 ( ) μm fiber width 23.5 (5-60) μm Sodium silicate + Aluminum sulfate + water Aqueous solution ph around 3.8

10 3 Adhesive 30 ml PVAC 4.3%wt Starch 4.3%wt PVA 4.3%wt 2 Water+Si-Al compounds Total 1000 ml 500 and 900 ml Sodium silicate 0.82%wt Aluminum sulfate1.08%wt 4 Chlorinated parraffin46g + Alkyl Ketene Dimer(AKD) 50 ml 5 Surfactant 10%wt 50 ml (SDBS) 6 ph adjustment to Fine fiber 50g Pulp Disintegrator

11 Pulp disintegrator Mould cm min for filtering water Drying equipment 95, 10 h SEM-EDS 25 kv, 7μA, 10 mm Cone Calorimeter ULDF cm, 780, 50 kw/m 2

12 a: 500 ml Si-Al solution b: 900 ml Si-Al solution a: 500 ml O: 52.43% Al: 11.04% Si: 4.33% Cl: 22.16% b: 900 ml O: 57.57% Al: 14.95% Micro morphology Si: 6.75% Cl: 13.52% Element mappings

13 Heat release and mass loss Specimens thickness: 30 mm Heat flux: 50 kw/m 2 a: 500 ml Si-Al aqueous solution b: 900 ml Si-Al aqueous solution HRR (kw/m 2 ) HRR (kw/m 2 ) ( kw/m 2,( , 10 s) s) kw/m 2, 10 s) a a a (61.14 kw/m 2, 2 b b ( , 10 s) s) kw/m 2 b, 10 s) b b b a a 2 2a b b a a Time (s) (s) Time (s) Time (s) Time (s) Time (s) Time (s) Time Time (s) (s) HRR (kw/m 2 ) THR (MJ/m 2 ) THR (MJ/m 2 ) THR (MJ/m 2 ) Heat release rate (HRR) Total heat release (THR) Mass residual ratio Mass residual ratio (%) Mass residual ratio (%) Mass residual ratio (%)

14 Smoke, CO and CO 2 release Specimens thickness: 30 mm Heat flux: 50 kw/m 2 a: 500 ml Si-Al compounds solution b: 900 ml Si-Al compounds solution TSR (m 2 /m 2 ) From burning residue and ash Incomplete combustion Time (s) Total smoke release (TSR) b a CO (%) Flammable volatiles Blowing combustion of char b a Time (s) CO concentration CO 2 (%) Complete combustion a b Time (s) CO 2 concentration

15 Distribution of Si-Al compounds in the material Covered the surface of fibers Relatively evenly filled into open holes More Si-Al compounds, higher weight ratios of Al and Si

16 Fire properties of ultra-low density fiberboard More Si-Al compounds, better effect on fire properties Fire intensity and combustion extent Released amount of heat, smoke, off-gases, as well as mass loss The more, the better? Consider about foaming conditions and mechanical properties Amount of Si-Al compounds 1000 ml

17 The samples before and after burning 500 ml 900 ml Original sample Burned samples 500 ml 900 ml Microstructure of burned samples

18 Thanks for your attention! Questions? Please speak slowly. Thanks!