FLAME RETARDANT FIBRE REINFORCED POLYESTER FORMULATION FOR ROOFING APPLICATION
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1 Asia-Pacific Conference on FRP in Structures (APFIS 27) S.T. Smith (ed) 27 International Institute for FRP in Construction FLAME RETARDANT FIBRE REINFORCED POLYESTER FORMULATION FOR ROOFING APPLICATION R. Vasanthakumari Department of Polymer Technology, B S A Crescent Engineering College, Chennai 6 48, India ABSTRACT Composite materials, especially fibre reinforced plastics (FRP), are widely used in different fields such as aerospace, automobile, electrical and electronics, domestic, building and construction. In developing countries like India that low cost housing / building is to be provided within short duration at times of natural crisis such as Tsunamis, earthquake, floods etc. With this main objective the present work is aimed at carrying out studies systematically using different Flame retardant additives such as ATH, Sb 2 O 3, a novel halogenated compound, Tricresyl phophate at different loading levels with general purpose unsaturated polyester resin and chopped strand glass fibre mat. The FRP laminates were prepared using hand lay up method and the samples were tested for various properties such as mechanical, thermal, flammability and smoke density tests. The work is focused on arriving at cost effective flame retardant additive combination with excellent properties compared to the currently used grades in FRP industry. KEYWORDS Flame retardant additives, FRP, TCP, ATH, deca bromo compound and antimony oxide INTRODUCTION Composites are rapidly replacing all conventional materials in many applications such as aerospace, automobiles, electricals and electronics and construction due to their high strength, low cost, easy process ability and availability in various forms and shapes with good aesthetics. Considering composite materials as a whole, there are many different material options to choose from in the areas of resins, fibres and cores, all with their own unique set of properties such as strength, stiffness, toughness, heat resistance, cost, production rate etc. Thus, the selection of materials and processing method play a major role in end use application areas. Though fibre reinforced plastics are widely used in other fields, in building and construction their flammability is producing a major threat. Lots of studies have been carried out in the areas of usage of various flame retardant additives/compounds in fibre reinforced plastic composites for various applications (Choi et al. 2, Dvir et al. 23, Honda et al. Eur Pat.). Glass fibre, aramid and carbon fibre reinforced with epoxy, phenolic and polyester have been tried for building construction of structural beams and panels etc. (Grace et al. 22, 23, 24, Bencardino et al. 22, Chajes et al. 1995, Chaallal et al 1998, Harris et al. 1998). The present paper is aimed at developing systematically a method of preparation of fibre reinforced plastic with Vo flame rating to suit the needs of poor people, particularly for roofing application in place of thatched roof and asbestos sheet. Various commercial FR additives were tried and systematically studied for their flammability characteristics without compromise on their other mechanical properties. 637
2 METHOD OF SOLUTION Materials Used The following materials were tried in this work Matrix material - Unsaturated polyester resin (Generous purpose resin from M/s Vasavi bala resins, Pvt Ltd, India) Reinforcement - Chopped Glass Strand Mat-45g/mm 2 (supplied by FGP Ltd ) Flame retardant additives - Aluminium tri hydrate (ATH), Deca Bromo diphenyl ether ( DeBDE) Antimony trioxide (Sb 2 O 3), Tricresyl Phosphate (TCP) (Lab grades used as such ) Curing system - Methyl ethyl ketone peroxide (MEKP), Cobalt Napthanate (Lab grades are used as such) FRP Compositions Various FRP compositions were tried in this work but in all the compositions the matrix resin and glass fibre were kept in the ratio and the various additive compositions tried were : 1) ATH at different loadings of 15, 2, 25, 4, 5 and 6 2) DeBDE & Sb 2 O 3 combination in 3:2 ratio at different loadings of 5, 1, 15, 2 and 25 3) TCP at 5, 1 and 15 Processing Method By using the above mentioned matrix material, reinforcement and additives the laminate sheets (3*3*3mm) were prepared by hand lay-up technique. The laminate sheets were tested for different properties as per ASTM standards as shown below Results and Discussion Property details Standard used Gel time and Gel Point ASTM D 2471 Tensile strength ASTM D 638 Flexural strength ASTM D 79 Izod impact strength ASTM D 256 Barcol hardness ASTM D 2583 Limiting oxygen Index (LOI) ASTM D 2863 Smoke density ASTM D 2843 Flammability UL 94 FRP laminates at different loading levels of Flame retardant additives such as ATH, TCP, antimony oxide and Deca bromo compound were prepared using hand lay - up method and characterized for various parameters. Hand lay up method was chosen since the objective of the work to identify the optimum composition of the FR formulation. In all the cases the flame retardant fillers were added to resin and glass fibre combination. A. Studies with ATH Flame Retardant Fig. 1 shows the effect of ATH on gel time and the maximum exothermic temperature reached during the mixing process. From the Figure it is clear the gel time in ATH filled formulation do not change much while there is a gradual decrease in the gel point of the resin formulation with the increase in ATH content. APFIS
3 Resin: Glass Filler content, Table 1. Effect of Aluminium Tri Hydrate on Mechanical Properties Tensile Flexural Barcol Hardness Impact (J/mm) ATH ATH ATH ATH ATH ATH Gel 18 time ( Min.) ; Gel point ( Deg C) 16 Gel time Gel Point ATH content Figure 1. Effect of ATH on gel time and peak exothermic temperature Table 1 and Fig 2 show the effect of ATH on mechanical properties of the composite. It is evident that the tensile strength is higher for the ATH filled grade and is also increasing with increasing the percentage of filler. There is not much variation in flexural strength and impact strength with the increase in the ATH content. There is an increasing trend in the values of hardness with the increase in ATH content. The results show that ATH works as a reinforcing filler along with the glass fiber. Tensile & Flexuralstrength(N/m m2) of T.S & F.S Tensilestrength- T.S Flexuralstrength- F.S elongation of T.S elongation of F.S Composition of ATH Figure 2. Effect of ATH on Tensile and flexural properties ATH can act as a flame retardant for polymer burning since it eliminates water molecules at high temperature diluting the flammable gases thus retarding flame.resistance to spread of flame was measured as per UL 94 standard and the results show that even upto 6 loading of ATH to resin / Glass fibre (7/3) combination do APFIS
4 not meet the specification of Vo rating. Only at very high ATH filler loading (more than 13) the laminates showed flame retardancy meeting the V rating. B. Studies with Tricresyl Phosphate TCP is known as a plasticizer and flame retardant and the effect of TCP on mechanical properties of the composites is given in Table 2 and Fig. 3. Since the cost of TCP is high up to only 15 loading of TCP was done and studied the properties. Tensile strength was found to increase with TCP content while there is a decrease in flexural strength observed. Both hardness and impact properties were found to have a marginal increase in the values with TCP content. Resin:Glass Table 2. Effect of Tri Cresyl Phosphate On Mechanical Properties Filler content, Tensile Flexural Barcol Hardness Impact (J/mm) 5 Tri cresyl phosphate Tri cresyl phosphate Tri cresyl phosphate Tensiles & Flexuralstrength (N/mm2) Composition of TCP of T.S & F.S Tensilestrength-T.S Flexuralstrength-F.S elongation of T.S elongation of F.S Figure 3. Effect of TCP on tensile and flexural properties The flammability testing as per UL-94 standard showed that TCP filled compositions fail to meet V specification but the rate of spreading of flame was found to be very low. Still higher concentration of TCP may, however, gives better flame retardancy properties but owing to high cost further loading beyond 15 was not carried out. C. Studies with DeBDE and Antimony Oxide It has been shown (Vasanthakumari 1995) that there is a synergistic effect in flame retardancy when a combination of antimony oxide and halogenated compound is used with engineering thermoplastic material. Here deca bromo dephenyl ether (DeBDE) and antimony trioxide were used in the ratio 3:2. In the present work also the same ratio of DeBDE and antimony oxide was maintained at different levels ranging from 5 to 25 The effect of DeBDE and antimony oxide on gel time and gel point during the mixing process is shown in Table 3 which reveals that the gel time is not affected significantly while there is a decrease in the gel point with the increase in filler content. APFIS 27 64
5 Table 3. Effect of 3:2 of Deca Bromo diphenyl ether & Antimony tri oxide on Gel time & Peak exothermic temperature Resin: Glass Filler content Gel Time (minute) Gel Point, Deg C DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O The plot of the mechanical properties (Table 4 and Fig 4) reveal that there is a drop in both tensile and flexural strength values at lower levels of filler content and at 25 of DeBDE and antimony oxide content they become equal to that of the unfilled material. Further there is no significant change in the elongation values. There is an increasing trend in both the hardness and impact strength values with the increasing filler content. Resin:Glass Table 4. Effect of 3:2 of Deca Bromo diphenyl ether & Antimony tri oxide on Mechanical Properties Filler content, (DeBDE/ Sb 2 O 3 3:2) Tensile Flexural Barcol Hardness Impact (J/mm) DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O Tensile & Flexuralstrength (N/mm2) of T.S & F.S Composition of DeBDE & Sb2O3 T.S F.S elongation of T.S elongation of F.S Figure 4. Effect of 3:2 of Deca Bromo diphenyl ether & Antimony tri oxide on tensile and flexural properties The flammability testing as per UL-94 standard showed that DeBDE laminates gave V rating for the filler content 1 and above (Table 5) and the flame was put off within a few seconds. DeBDE and Sb 2 O 3 (3:2) follow the gas phase mechanism at higher temperature and produce a synergistic product antimony bromide which puts off the fire. The limiting Oxygen Index and smoke density are additional parameters which can help in assessing the flame retardancy characteristic of the material. The LOI and smoke density measurements were APFIS
6 made for the FRP laminates containing the DeBDE and Sb 2 O 3 1 and above, since these samples showed V rating (Table 6). There is an increase in the smoke density values with the increase in filler content which reached a maximum of at 25 filler loading. High value of smoke density is attributed to the evolution of decomposition products such as water, carbon dioxide etc. LOI values are found to be much higher than that of the laminates without the filler. Table 5. Flammability Test (UL-94, V rating): Resin:Glass Filler content, Time taken to Retard flame (Seconds) Burning 5 DeBDE & Sb 2 O 3 Burning 1 DeBDE & Sb 2 O 3 2, Vo 15 DeBDE & Sb 2 O 3 2, Vo 2 DeBDE & Sb 2 O 3 2, Vo 25 DeBDE & Sb 2 O 3 2, Vo Table 6 : LOI and smoke density of DeBDE filled formulations Resin:Glass Filler content, LOI () Smoke Density () Grade Resin Grade Resin DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O DeBDE & Sb 2 O D. Studies with a Combination of Different FR Fillers Even though DeBDE & Sb 2 O 3, combination showed V rating, the mechanical properties were found to be low compared to the compositions containing ATH content. Therefore to enhance the mechanical properties a combination of DeBDE, Sb 2 O 3 and ATH was trialed. Table 7 Comparison of the test parameters of the laminates at the optimum filler loading Test Parameter Gel time, min Gel Point, Deg C Tensile, at break, Flexural strength, at break, Barcol hardness Impact strength, J / mm Time taken to retard the flame, UL94 LOI, Smoke density of resin and glass fiber Burning of resin and Glass fiber containing 1 DeBDE and 25 ATH Flame put off in fraction of a sec, Vo Table 7 gives the results obtained with FRP laminates with (1 of 3:2 DeBDE and antimony oxide with 25 ATH) and without the filler. All the tested parameters showed significant improvement with the filler content. There is an increase in mechanical properties and in addition to this, flammability tests revealed excellent performance. DeBDE and Sb 2 O 3 follow the gas phase mechanism at higher temperature and produce a APFIS
7 compound antimony bromide which puts off the fire. In addition to this presence of ATH releases water vapour which dilutes the flammable gases, thereby producing double retardancy effect. Further due to the presence of ATH the mechanical properties were found to be good. The smoke emission of this sample was found also to be lower due to the presence of ATH which acts as a smoke suppressant. Morphological studies using SEM for this composition showed a better compatibility between matrix resin and filler explaining the properties achieved. CONCLUSIONS The development of Reinforced Plastics for roofing application using various flame retardant additives has been carried out successfully. Several flame retardant additives like Aluminium Tri hydrate, antimony trioxide, Tri cresyl phosphate, Deca Bromo diphenyl ether were tried to make composites with desired properties. It has been found that ATH improved mechanical properties and even up to 6 loading of the same do not give flame retardant property. TCP addition also donot provide desirable properties both mechanical and flame retardant properties at the loading levels under study. The combination of 3:2 ratio of Deca Bromo diphenyl ether and antimony trioxide showed a considerable improvement in the flame retardant property but they suffered mechanical property enchancement. The major draw back in this combination, namely, low mechanical properties and high smoke emission was overcome by adding 25 ATH and 1 DeBDE and Sb 2 O 3. Hence, it is concluded that 1 of Deca Bromo diphenyl ether and antimony Tri oxide (3:2) with 25 of Aluminum Tri hydrate meet the required mechanical and flame retardant properties and is more cost effective than the FR formulation used by the FRP industry. Further studies are essential for roofing application of the identified composition which is in progress. ACKNOWLEDGEMENT The author wishes to acknowledge the support provided by M/s Urbane Industries, a FRP industry, Chennai in suggesting the problem and carrying out the lamination trials and flammability testing. The author wishes to mention that a part of the present paper is from the project work of the B Tech students R. Senthilkumar, D. Durai babu, K. Sabithadevi, R.Sheelaramani REFERENCES Choi, H.J., Park S.H., Kim, J.K. and Jun J.I. (2). J Appl. Polymer Science, 75 (3). Dvir, H., Gottlieh, M., Daren, S. and Trtakovsky. E. (23). Composites Science and Technology, 63(13), Honda, N et al, [Toshiba Chemical Corporation], European Patent, EP,795,57. Grace, N.F., Abdel-Sayed, G. and Ragheb, W.F. (22). ACI Structural Journal, 99(5), Grace, N. F., Ragheb, W.F. and Abdel-Sayed, G. (23). ACI Structural Journal, 1(6), Grace, N. F., Ragheb, W.F. and Abdel-Sayed, G. (24). ACI Structural Journal, 11(2), Bencardino, F., Spadea, G. and Swamy, N. (22). ACI Structural Journal, 99(2), Chajes, M.J., Januszka, T.F., Mertz, D.R., Thomson, T.A. and Finch, W.W. (1995) ACI Structural Journal. 92(3), Chaallal, O., Nollet, M.J. and Perraton, D. (1998) Journal of Composites for Construction, ASCE, 2(2), 2, Harris, H.G., Somboonsong, W. and Frank, K.K. (1998) Journal of Composites for Construction, ASCE, 2(1), R. Vasanthakumari (1995). Research Report, SRF ltd, Private publication. APFIS
8 APFIS
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