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Jasmi20120200007 44917662
1.
Journal of Analytical
Sciences, Methods and Instrumentation, 2012, 2, 87-91 87 doi:10.4236/jasmi.2012.22016 Published Online June 2012 (http://www.SciRP.org/journal/jasmi) Comparison between Pigment Printing Systems with Acrylate and Butadiene Based Binders Mansoor Iqbal, Javaid Mughal, Munazza Sohail, Arsheen Moiz, Kamran Ahmed, Khalil Ahmed* Applied Chemistry Research Centre, PCSIR Laboratories Complex, Karachi, Pakistan. Email: *khalilmsrc@gmail.com Received December 25th, 2011; revised January 16th, 2012; accepted January 31st, 2012 ABSTRACT Pigment printing was carried out on lab scale by simple screen-printing techniques. By the application of acrylate and butadiene based binder, the crocking fastness, formaldehyde release and PVC migration of fabric printed with Imparon red KB pigment was evaluated. The effect of curing time on K/S values was also investigated. It has been found that butadiene based binder shows good performance in terms of crocking fastness, formaldehyde release and PVC migra- tion. It has also been observed that by increasing the binder concentration, the release of formaldehyde decreased and by increasing the curing time, the K/S values of printed fabric were decreased. Keywords: Printing; Pigment; Binder; Acrylate; Butadiene 1. Introduction vinyl chloride, dichloroethene, acrylic acid, acrylonitrile, acrylic acid esters & ethers. The binder used in the pig- Cotton is one of the most important fibers in the textile ment printing process is usually based on styrene-buta- industry and its coloration could be achieved with either diene, styrene acrylate or vinyl acetate—acrylate co- dyes, by dyeing or printing in aqueous solution, or with polymer [5] .Binders are the mechanism used to keep the pigment by using a print paste. Printing of cellulosic fi- color on the fabric when using pigments for printing tex- bers are considered to account for more than 70% of all tiles. The choice of binders will always depend upon the printed substrates and pigment printing is a major final fastness requirements as well as the cost require- method [1]. The use of pigments for printing of textile ments of the process. Choosing a binder for pigment col- products has dramatically increased over the last 50 years. oration is a complex but critical step in developing a rec- Pigments are now used to produce printed products for a ipe which will meet very specific requirements. The number of end uses including apparels, home furnishing, place to start to determine which final fabric properties crafts and nonwoven articles of the over 18 billion liners are important as various end use applications may require yards of printed fabric produced worldwide each years, a different polymer to achieve the desired results [6]. about 50% of this yardage is pigment printed. In the Almost all the binders used in textile pigment printing united state alone, currently about 80% of all printing is are the addition polymerization products. They are actu- done with pigment [2]. There are of course limitations to ally copolymer type; the structure may be represented as balance against the substantial advantages of pigment Figure 1 [7]. printing. The printer should be fully aware of these, since The binder film in pigment print is a three-dimensional the use of pigments in applications where dyes are re- structure, the third dimension is rather less important quired can bring about a negative attitude to pigments, even in suitable applications [3] .In pigment printing , than the other two. The binder is a film-forming sub- insoluble pigments, which have no affinity for fibers, are stance made up of long chain macromolecules, which fixed on to the fibers with binding agents or binders [4]. when applied to the textile together with the pigment, Depending upon the properties required in the binding produces a three-dimensionally network. The links are film (softness, elasticity, plasticity, solvent stability), binders can be tailor-made by choosing suitable base product. It is necessary to copolymerize different mono- mers. Typically, unsaturated monomers are used, such as * Corresponding author. Figure 1. Copyright © 2012 SciRes. JASMI
2.
88
Comparison between Pigment Printing Systems with Acrylate and Butadiene Based Binders formed during some suitable fixing process, which usu- absorption and evaporation. The dispersed solids coagu- ally consists of dry heat and change in pH value, bringing late to form a gel-like layer of very tightly packed ‘balls’, about either self-crosslinking or reaction with other suit- which have only poor solidity and adhesive properties. If able crosslinking agents [8]. Elasticity and improved the mechanically more stable, more redispersible, disper- adhesion of the film to the substrate is achieved by sion binders are used, these coagulated particles can be crosslinking. The crosslinking reaction must produce brought back to their original form by rubbing them with covalent bonds, which are insensitive to hydrolyzing water. During the second phase, the gel particles flow agents (washing liquor, perspiration, industrial atmos- together to form a continuous film. phere). The reaction should be activated in dry hot air by The lowest temperature at which a film can be formed curing process [9]. While the prints are being dried, a depends upon chemical constitution, but for pigment film is formed from the dispersed binder. Its formation printing it is usually around 5˚C. The speed at which the takes place in two stages: flocculation (or coagulation) film is formed depends upon the range of particle size and coalescence. During the first stage of film formation, [10]. The reaction between the binders and the cellulosic water and surfactants are removed from the binder by substrate may be represented as follows in equation: Binder-CH 2 -OR HO-Cellulose Binder-CH 2 -O-Cellulose + ROH where R is CH3 or H. ing. Samples were cured on curing machine of Rapid. Cross linking increases the crocking, washing and dry Crocking fastness evaluated on AATCC Crock meter cleaning fastness properties, but detrimentally affects the (CM-5 SDL Atlas), Fastness rating was evaluated on handle of the fabric. When the binder molecule have no color matching cabinet of Verified by comparing with self-crosslinking groups, an additional cross linking agent grey-scale. The viscosity of the thickener paste was de- such as urea formaldehyde or melamine formaldehyde termined by Brookfield viscometer (DV-E model) with condensate, methylolated urethane compounds etc, hav- spindle number 6.The relative color strength of the prints, ing at least two reactive groups per molecule are added in expressed as K/S values L, a, b, c CIE lab of the printed the binder system [11]. samples were determined by reflectance measurements The present research work demonstrates the comparisons using Data color international spectrophotometer SF600. between pigment printing systems with acrylate and buta- diene based binders. The influence on the crocking fast- 2.4. Print Paste Preparation ness, PVC migration, formaldehyde release and K/S values of the printed cotton fabric has also been investigated. The print paste was prepared in soft water with heavy string by adding 15 g/kg acrylate and butadiene based 2. Experimental binder separately, 12 - 14 g/kg thickener, 6 g/kg ammo- nia to attain a pH 8 - 9 and 0.7% - 0.8% w/w fixative 2.1. Material were also added. Each print paste was prepared with 5% An optical brightener free, 100% cotton woven fabric Imparon KB pigment and 95% stock paste. The viscosity having construction 25 ends/cm2, 21 picks/cm2 and an of the final print paste was 28000 cps as determined with area density of 142 gm/m2 was used for pigment printing Brookfield viscometer. purpose. The fabric was desized enzymatically, scoured and bleached by an exhaust method. 2.4.1. Print Method The printed fabric dried at 120˚C for 2 min and cured at 2.2. Chemical & Colorants 155˚C for 5 minutes. Commercial pigment Imparon KB of BASF was used as a colorant in the printing process. Two different binder, 2.4.2. Fastness Testing binder ET (polyacrylate based) and halazarine binder The fastness properties were determined according to the FRS (butadiene based) of BASF were used. Leutexol HP international standards of textile testing. The specific was also supplied by BASF and used as a thickener. tests used were ISO-105-X10, BS1006:1990 (Assessment Printofix WB liquid (melamine based) used as a fixative. of migration of textile color into polyvinyl chloride coat- All other chemicals ammonia, urea, polyvinyl chloride, ing), ENISO-14184-1:1998 (Formaldehyde release), TiO2 were purchased from Merck chemicals Pakistan AATCC-08 (color fastness to crocking) [12-14]. limited. 3. Results & Discussion 2.3. Equipments The pigment printing was performed with 5% Imparon Printing was carried out by laboratory hand screen-print- red KB pigment in the laboratory with simple screen Copyright © 2012 SciRes. JASMI
3.
Comparison between Pigment
Printing Systems with Acrylate and Butadiene Based Binders 89 printing method. The effect of two different binders, binders with increase in binder concentration. Butadiene acrylate based and butadiene based on crocking, PVC showed minimum values of formaldehyde content i-e migration and formaldehyde release were investigated. 0.87 ppm at a concentration ratio of 15 g/l. It may be due to the interaction of the formaldehyde molecules with the 3.1. Effect of Binder Concentration on K/S binders and also the butadiene based binders have more Values reactive sites as compared to the acrylate based binder As the binder concentration increases, the K/S values of and probability of crosslinking with formaldehyde mole- both printed fabric treated with acrylate and butadiene cule will be more in case of butadiene based binder as based binder increases however the K/S values recorded compared to the acrylate based binder (Figure 4). for fabric treated with butadiene was higher than the fab- ric treated with acrylate based binder (Figure 2). The 3.4. Effect of Binder Concentration on Crocking maximum values of K/S, 13.46, attained at a butadiene Fastness concentration of 15 g/l. Pigment particles are molecular As the butadiene concentration increases the wet and dry aggregates which does not contain any groups capable of reacting with fibers or substrate. The size and lack of crocking fastness for both butadiene and acrylate based functionality required that pigment could be bonded to binder also increases. At a binder concentration of 15% the fibers by the use of binder, which is a high molecular the butadiene binder shows optimum results of crocking weight film forming material. The binder is the only i.e. 5 both for wet and dry crocking (Table 1). linkage between pigment and the fabric and therefore plays crucial part in determining the color strength of the finished fabric. 3.2. Effect of Curing Time on K/S Values The K/S values decreases with increase in curing time of the printed fabric treated with both butadiene and acry- late based binder. The maximum K/S values, 13.72 have been recorded after 2 minutes for butadiene based binder (Figure 3). The curing time slightly affects K/S values; the binder which encloses the pigment molecules, forms a film under curing conditions. The improved adhesion of the film to the substrate could be achieved by crosslink- ing. The reaction should be activated in dry hot air. 3.3. Effect of Binder Concentration on Binder 1: Butadiene binder; Binder 2: Acrylate binder. Formaldehyde Release Figure 3. Curing time v/s KS value. The formaldehyde release decreased for both type of K/S 1: Butadiene binder; K/S 2: Acrylate binder. Binder 1: Butadiene binder; Binder 2: Acrylate binder. Figure 2. Binder concentration v/s KS value. Figure 4. Binder concentration v/s formaldehyde content. Copyright © 2012 SciRes. JASMI
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Comparison between Pigment Printing Systems with Acrylate and Butadiene Based Binders Factors that affect crocking are the elasticity of the Table 1. Colorfastness to crocking (AATCC-08). binder in conjunction with the pigment film placement on Butadiene Acrylate the fabric and the quantity of the binder in the mixture. % of Binder Also important is the adhesion of the pigment to the fab- Dry Wet Dry Wet ric with uniformity of the pigment within the color ma- 10% 4 3 3-4 2 trix. Factors which affect wet crocking are the toughness 11% 4 3-4 3-4 2-3 of the binder film as well as the water resistance of the 12% 4 4 4 2-3 binder. Butadiene improves the crock fastness and also 13% 4-5 4 4-5 3 softened the hand of the fabric. Butadiene is unique in the fact that it contains two reactive double bond, one 14% 4-5 4-5 4-5 3-4 polymerized there remain one unsaturated double bond. 15% 5 5 4-5 3-4 Thus double bonds give butadiene its elastic properties which make it soft and provide good dimensional recov- Table 2. Effect of PVC migration with butadiene binder. ery. Acrylates are thermoplastic polymers which mean Binder Concentration/ they do not have good dimensional recovery. This results Curing time L a b C K/S in reduced abrasion resistance. All acrylates binders re- quire copolymerization with functional monomers to 13% for 4 min 89.23 5.23 0.82 1.68 0.78 achieve acceptable fastness properties. 13% for 5 min 91.23 4.03 0.68 1.42 0.34 13% for 6 min 91.27 4.12 0.65 1.27 0.32 3.5. Effect of Binder Concentration on PVC Migration Table 3. Effect of PVC migration with Acrylate Binder. Tables 2 and 3 show the Effect of Binder Concentration on PVC migration. At a concentration of binder i.e. 13% Binder Concentration/ L a b c K/S the K/S indicates that PVC migration decreases after 6 Curing time minutes. It is found to be minimum for both types of 13% for 4 min 88.47 6.50 1.06 2.08 0.86 binder. The minimum values of PVC migration could be 13% for 5 min 89.80 5.43 0.88 1.63 0.67 achieved for butadiene after 6 minutes at K/S values of 0.32. It may be due to the cross linking properties of for- 13% for 6 min 90.05 5.23 0.72 1.34 0.48 maldehyde which resist the PVC migration. labored and irregular, lacrimation may occur, defecation 3.6. Binder Toxicity and urination increase, and finally reflex activity ceases and the person die in coma [16]. A very large number of workers in the plastics and textile industry are exposed to acrylic and butadiene based polymers. The widespread use of these polymers in in- 4. Conclusions dustry and in certain laboratories raises questions perti- The present studies have been made to evaluate the nent to their toxicological properties and their short- and crocking fastness properties, PVC migration and formal- long-term health effects on persons exposed to them. dehyde release of pigment printed fabric by the use of Butadiene is listed as a potential carcinogen by the In- acrylate based binder and butadiene based binder. By the ternational Agency for Research on Cancer (IARC), above investigation the following conclusions have been among others. It has been shown to cause cancer in labo- drawn. ratory. Butadiene Epidemiology studies have linked em- Butadiene showed good results of PVC migration, ployment in two different chemical operations each with crocking fastness and formaldehyde release as compared a Different type of cancer. The factors causing these ex- to the acryalate based binder. Butadiene showed minimum cess cancers have not been determined because the value of formaldehyde content of 0.87 ppm at a concen- workers were also exposed to other chemicals. Butadiene tration of 15%. The K/S values of butadiene binder found has caused birth defects and also injury to reproductive to be maximum after 2 minutes i.e. 13.72, at a binder organs [15]. concentration of 15%; the butadiene showed optimum Generally, the systemic toxic effects of the lower mo- results of crocking i.e. 5 both for wet and dry rubbing. lecular weight acrylic based polymers are manifested by An increase in the binder concentration will results in an immediate increase in respiration followed by a de- lowering the formaldehyde release for both type of bind- crease in 15 - 40 min. A prompt fall in blood pressure ers, however this release is minimum in case of butadi- also occurs, followed by recovery within 4 - 5 min. As ene binder. It has also been observed that as the curing the person approaches to death, respiration becomes time increased the value of K/S decreased for both type Copyright © 2012 SciRes. JASMI
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Comparison between Pigment
Printing Systems with Acrylate and Butadiene Based Binders 91 of binders. Printing and enhancement of fastness properties,” Journal of Chemical Society of Pakistan, Vol. 31, No. 1, 2009, pp. 145-150. REFERENCES [9] A. Johnson,” The theory of Coloration of Textiles,” 2nd [1] M. M. Molla, “Synthesis of Polyurethane Acrylate Oli- Edition, Dyers Company Publications Trust, Bradford gomers as Aqueous UV-Curable Binder for Inks Jet in England, 1989. Textile Printing and Pigment Dyeing,” Dyes and Pig- [10] W. C. Miles, “Textile Printing,” 2nd Edition, Society of ments, Vol. 74, No. 10, 2007, pp. 371-379. Dyers and Colorist, Bradford England, 2004. doi:10.1016/j.dyepig.2006.02.021 [11] V. A. Shenai, “Chemistry of Textile Auxiliaries,” 2nd [2] K. Oza and K. Shah, “Aqueous System for Pigment Print- Edition, Sevak Publisher, Mumbai, 2002. ing,” Textile Dyers and Printers, Vol. 21, No. 11, 1988, [12] AATCC Test Method-8, Color Fastness to Crocking, pp. 21-25. 2005. [3] A. Poehlmann, “Pigment Printing System,” Textile Indus- [13] ISO-105-X10, BS 1006, “Assessment of Migration of tries Dyegist, Vol. 11, No. 10, 1992, pp. 4-9. Textile Color into Polyvinyl Chloride Coating,” 1990. [4] R. M. Christie, “The Chemistry of Color Application,” 1st [14] EN-ISO14184-1, “Textiles, Determination of Formalde- Edition, Blackwell Science, England, 2000. hyde, Part 1, Free and Hydrolyzed Formaldehyde Water [5] W. C. Miles, “Textile Printing,” 2nd Edition, Society of Extraction Method,” 1998. Dyers and Colorist, Bradford England, 2004. [15] American Chemistry Council, “Butadiene Product Stew- [6] G. Hammonds, “Pigment Printing Handbook,” 1st Edition, ardship Guidance Manual,” 2010. American Association of Textile Chemist and Colorists, http://www.dow.com/productsafety/pdfs/butadiene_guide Research Triangle Park, N.C, 1995. .pdf [7] V. A. Shenai, “Technology of Textile Printing,” 2nd Edi- [16] J. Autian, “Structure-Toxicity Relationships of Acrylic tion, Sevak Publisher, Mumbai, 1990. Monomers,” Environmental Health Perspectives, Vol. 11, [8] Mansoor Iqbal, “Effect of Cross linking in Textile Pigment No. 2, 1975, pp. 141-152. doi:10.1289/ehp.7511141 Copyright © 2012 SciRes. JASMI
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