Preparaton of masterbatch containing anti-oxidation additive: effect of carrier resin ratio and additives content

In this article, we investigated effect of carrier resin ratio and anti-oxidation additives content on properties of anti-oxidant additives Masterbatchs (MBs). The characteristics were measured by: melt flow index (MFI), morphology (SEM), tensile strength and elongation at break. The results indicated that: increasing LLDPE content in carrier resin led to decreasing mechanical properties, MFI weren’t uniform in MBs. With 80/20 of LDPE/LLDPE ratio, the tensile strength and elongation at break values were highest (21.0 MPa, 680.5 %).
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Preparaton of masterbatch containing anti-oxidation additive: effect of carrier resin ratio and additives contentVietnam Journal of Science and Technology 56 (2A) (2018) 56-62 PREPARATON OF MASTERBATCH CONTAINING ANTI-OXIDATION ADDITIVE: EFFECT OF CARRIER RESIN RATIO AND ADDITIVES CONTENT Duong Thi Thao1, Nguyen Phi Trung1, Hoang Thi Huong1, Tran Vu Thang2, Nguyen Van Khoi2, *, Trịnh Duc Cong2, Hoang Thi Phuong2 1 Institute of Research and Development on Novel Materials, 350 Lac Trung, Hai Ba Trung, Ha Noi 2 Institute of Chemistry, VAST,18 Hoang Quoc Viet, Cau Giay, Ha Noi * Email: khoinguyen56@gmail.com Received: 28 March 2018; Accepted for publication: 10 May 2018 ABSTRACT In this article, we investigated effect of carrier resin ratio and anti-oxidation additivescontent on properties of anti-oxidant additives Masterbatchs (MBs). The characteristics weremeasured by: melt flow index (MFI), morphology (SEM), tensile strength and elongation atbreak. The results indicated that: increasing LLDPE content in carrier resin led to decreasingmechanical properties, MFI weren’t uniform in MBs. With 80/20 of LDPE/LLDPE ratio, thetensile strength and elongation at break values were highest (21.0 MPa, 680.5 %). In addition,when increased anti-oxidant additives content, mechanical properties increased to upper limitvalue, then decreased. With 25 wt.% of anti-oxidant additives, the tensile strength andelongation at break values were highest (21.0 MPa, 654.7 %), MFI were uniform in MBs(12 g/10 m). SEM images were evidence of greatly distribution in sample containing 25 wt.%additives. Consequently, the 90/10 of LDPE/LLDPE ratio, 25 wt.% anti-oxidant additives wereselected to prepare MBs.Keywords: anti-oxidation master batch, carrier resin, LDPE, LLDPE. 1. INTRODUCTION Plastics industry has important role in our life. Plastics products has many advantages:flexible, good mechanical properties, good resistance to water, acid-base resistance, easy tomanufacture various products by different processing, such as: injection molding, extrusion,blow molding, etc. However, in processing and using of products, polymer materials areoxidized, leading to decreasing of performance. To solve this problem, anti-oxidation additivesare introduced into polymer matrix [1]. There were many literatures which reported about ability of anti-oxidation additives fordifferent polymer matrix. Jozef Rychlýa et al. [2] investigated UV resistance ability ofpolypropylene film incorporating with different additives: Irganox HP 136 and Irganox 1010.Preparaton of masterbatch containing anti-oxidation additive: effect of carrier resin ratio …Characteristics were performed by Fourier Transform Infrared (FT-IR) and carbonyl index. Theresults showed that Irganox 136 was more effective in anti-oxidation than Irganox 1010. M.J.Galotto et al. [3] studied on anti-oxidation of food packaging containing anti-oxidant additive(Irganox 1076) and evaluated the migration of additive. The experimental results indicated that,Irganox 1076 had good performance in anti-oxidation, there hadn’t migration and influence ofadditive to food. Hassanpour et al. [4] investigated mechanical properties, the changes inchemical structure, oxidation induction time (OIT) of HDPE/EVA blends containing thesynergist of Irganox 1010 and zinc stearate. The results showed that, anti-oxidation ability ofsamples containing anti-oxidant additive was better than the samples without additive. Manyliteratures reported that anti-oxidation additives performed effective even using low level ofcontent (0.1 - 0.5 wt.%). To distribute greatly additives in polymer matrix and decrease dust in processing, additiveparticles were introduced to polymer matrix by using masterbatch form (masterbatch is acompound of polymer matrix (as carrier resin) and one functional additive, which has lowcontent of polymer and high content of additive). Masterbatch has influence on mechanicalproperties and dispersion of additives in end-using product. Effective of masterbatch dependsstrongly on carrier resin and the content of additives. However, there weren’t many researcheson carrier resin and content of additives for masterbatch. So, the aim of this paper was toinvestigate the effect of carrier resin ratio and anti-oxidant additives content on properties ofmasterbatch samples. 2. EXPERIMENT2.1. Materials Low density polyethylene (LDPE) (density: 0.925 g/cm3, MFI = 4 (1900C/2.16 kgf)(supplied by LyondellBasell – Netherland), Linear low - density polyethylene (LLDPE)(density: 0.924 g/cm3, MFI = 21 g/10 min (1900C/2.16 kgf) (supplied by ExxonMobil – USA).Anti-oxidation additives: Irganox 1076 (AO1076), Irganox 168 (AO168), Irganox 1010(AO1010) were supplied by Tianjin Bestgain Science & Technology – China. Zinc stearate wasimported from Singapore. PPA 2800 was supplied by Thanh Loc Chemistry Company – VietNam.2.2. Methods.2.2.1. Anti-oxidation additive – containing masterbatch preparation Masterbatch samples were prepared containing the mixture of anti-oxidant agent (Irganox168/Irganox 1010: 67/33 in weight), carrier resin polyetylene (LDPE, LLDPE), zinc stearate,PPA2800 with calculated amount. Masterbatch samples were blended in Supermix machine forone hour to disperse the components. Well-mixed ingredients were melting mixed in twin-screwextruder (model: BP – 8177 – ZB), the temperature profile: 110-125-130-135-140-140 0C, at aconstant rotating speed of 24 rpm). The extrudate was cut in pellets with cylinder sha ...