PARALOID K120N-K120ND Acrylic Processing Aid The Industry Standard for Controlled Fusion, Optimum Processing and Product Quality

Transcription

1 PARALOID K120N-K120ND Acrylic Processing Aid The Industry Standard for Controlled Fusion, Optimum Processing and Product Quality Description Over 35 years ago, Rohm and Haas introduced the first all-acrylic processing aid, pioneering a technological breakthrough. This addition has made rigid PVC processing possible, and therefore a viable material for many new applications. Today, PARALOID K120N and K120ND are industry standards, used in the production of bottles, in film/sheet applications and in the construction industry, representing a high proportion of the total sales of the world s acrylic processing aids for vinyls. In addition to faster fusion, PARALOID acrylic processing aids offer many attractive rheological features and improve the quality and finish of the product. These benefits will be evident from the results of the tests shown in this brochure. By dramatically shortening the fusion time, PARALOID K120N and K120ND can increase production output and improve yield. Improved fusion also permits a broader range of processing temperatures and conditions. Other processing benefits include improved melt-elasticity and reduction of plate-out and melt fracture. PARALOID acrylic processing aids improve product quality in terms of surface gloss and finish, more even thickness and weight, weld-line strength, tensile strength and impact efficiency. These benefits are obtained with the use of both PARALOID K120N and K120ND. In addition, PARALOID K120N and K120ND comply with the FDA and most European food packaging regulations.* PARALOID K120ND is generally chosen by manufacturers requiring excellent dispersibility and good optical properties, under low-shear processing conditions. The PARALOID K120N/K120ND production process has obtained the ISO 9002 quality assurance certification. * For further information on food contact compliance of our products, please refer to the local Rohm and Haas Sales Subsidary. Performance in Processing Using a PARALOID processing aid to change the polymer melt rheology provides the processors with a material that adapts to wide operational conditions and allows increased throughput. The addition of these products to PVC formulations improves the fusion behaviour and results in a more homogeneous melt. The high molecular weight of the processing aids also results in higher melt strength and higher rupture stress. Fusion PARALOID processing aids give a significant improvement to fusion, with faster fusion speed and higher fusion torque.

2 Brabender Rheology Test (Sn-Stabilised) This test shows the effect of changing rotor speed on rheology, with a bowl temperature of 150 C. Without Processing Aid K120ND, 1 phr 20 RPM 40 RPM 60 RPM 20 RPM 40 RPM 60 RPM Fusion time (s) Fusion torque (Nm) Fusion temperature ( C) Equilibrium torque (Nm) Sn Formulation S PVC K Sn mercaptide stabiliser 1.4 Glycerol mono-oleate 1.0 High molecular weight complex ester 0.6 Test conditions: Brabender bowl W50, stock weight 55g. This test shows the effect of changing bowl temperature on rheology, with a rotor speed of 40 RPM. Without Processing Aid K120ND, 1 phr 140 C 150 C 160 C 140 C 150 C 160 C Fusion time (s) Fusion torque (Nm) Fusion temperature ( C) Equilibrium torque (Nm) Brabender Rheology Test (Pb-Stabilised) Similar results are found in Pb-stabilised formulations.

3 Without Processing Aid K120N, 1 phr K120N, 2 phr Fusion time (s) Fusion torque (Nm) Fusion temperature ( C) Equilibrium torque (Nm) Pb Formulation Tri-basic Pb sulphate 4 Tri-basic Pb stearate 0.25 N Pb stearate 0.15 Calcium stearate 0.75 Partially esterified wax of montanic 0.20 acid High molecular weight paraffin wax 0.15 CaCO Pigment 0.01 PARALOID K120N processing aid as indicated Test conditions: 160 C, 50 RPM, 57g, W50 Brabender bowl Melt Strength and Homogenisation The marked increases in melt strength and homogenisation provided by the addition of PARALOID K120N and K120ND translate into reduced melt fracture and more detailed thermoforming, giving deeper draws without tearing. Rheotens Melt Elongational Test (Sn-Stabilised) The addition of PARALOID processing aids significantly improves the elongational properties, resulting in better thermoforming and blow moulding. The increased stress at break translates into reduced melt fracture and improved surface finish. The Rheotens test, which measures elongation and stress of polymer melts, characterises melt elastic properties directly from the extruder, and predicts the performance of compounds in the molten state. Without Processing Aid K120N, 2 phr K120ND, 2 phr Elongation (%) Die swell (%) Stress at break (N/mm 2 ) Sn Formulation Sn mercaptide stabiliser 1.5 Glycerine tri ester 1.0 Ester of montanic wax acid with Dihydric alcohol PARALOID BTA PARALOID processing aid as indicated

4 Extrusion conditions: Göttfert type 015 Screw diameter 30 mm Temperature ( C) - Cylinder 150, 160, Die head 180, 180 Screw speed (RPM) 10 Parison Extrusion Tests These tests, on Ca/Zn and Sn formulations, show the effect of PARALOID processing aids on flow time and weight, which translates into better control of wall thickness. Sn-Stabiliser Total Weight (g) Flow Time (s) Relative Die-Swell Without processing aid * K120N, 0.25 phr phr K120N, 0.75 phr K120N, 1.00 phr K120N, 1.50 phr K120ND, 0.25 phr K120ND, 0.50 phr K120ND, 0.75 phr K120ND, 1.00 phr K120ND, 1.50 phr Sn Formulation Octyl-Sn mercaptide stabiliser 1.5 Fatty acid of polyol 0.5 Epoxidised soya bean oil Ca/Zn-Stabilised Total Weight (g) Flow Time (s) Bottle Weight (g) Without processing aid K120N, 0.2 phr K120N, 0.5 phr K120ND, 0.2 phr K120ND, 0.5 phr Extrusion conditions: Bekum BA 07 Cylinder temperature ( C) 160, 170, Ca/Zn-stabilised Cylinder temperature ( C) 150, 160, Sn-stabilised Die head temperature ( C) 180, 180 Screw speed (RPM) 80

5 Ca/Zn Formulation Calcium hydroxy stearate 0.3 Zn octoate 23% Epoxidised soya bean oil Stearoyl Benzoyl methane 0.20 Glycerine tri ester 1.5 Polar PE wax 0.15 PARALOID BTA 736-S 6.0 Ca/Zn Formulation Calcium hydroxy stearate 0.3 Zn octoate 23% Zn Epoxidised soya bean oil Stearoyl Benzoyl methane 0.20 Glycerine tri ester 1.5 Polar PE wax 0.15 PARALOID BTA 736-S 6.0 Test conditions: Two-roll at 200 C 26/20 RPM Heat Stability The addition of PARALOID K120N and K120ND processing aids does not adversely affect heat stability. Dynamic Heat Stability (Ca/Zn-Stabilised) Typical Powder Properties K120N K120ND Bulk density aerated (g/cm 3 ) Bulk density packed (g/cm 3 ) Powder flowability, through 5-mm funnel (s) Fines level, 325 mesh (%) Performance in Finished Products PARALOID processing aids, in addition to enhancing the performance of processing, give a clear benefit to the finished products. Through good dispersion, the processing aid improves the surface quality without affecting organoleptic properties.

6 By insuring good fusion and the homogenisation of other additives, the addition of PARALOID processing aids will optimise the physical properties of the finished product. Surface Quality The addition of a PARALOID processing aid improves manufacturing production and gives a finished product the high gloss and excellent surface quality required. Melt Fracture Melt fracture, which is related to the compound formulation and to the shear stress, shear rate, and temperature of processing, limits manufacturing production rates and can reduce the quality of the finished product. The photographs below show how PARALOID K120ND reduces the melt fracture of extruded rods, greatly improving the surface quality. Clarity Test Because PARALOID processing aids are fully compatible with PVC, they do not affect the optical properties. In critical applications, K120ND is generally chosen for its superior performance. K120N, 1.0 phr K120ND, 1.0 phr LT (%) Haze (%) Yellowness index Ca/Zn Formulation Calcium hydroxy stearate 0.3 Zn octoate Epoxidised soya bean oil Stearoyl Benzoyl methane 0.20 Glycerine tri ester 1.5 Polar PE wax 0.15 PARALOID BTA 736-S 6.0 Transparency was measured using a Hunterlab colorimeter, with 1-litre 34g. round-ribbed bottles.

7 Dispersion PARALOID K120N and K120ND processing aids help dispersion of compounding additives, and do not contribute to gel formation. For critical applications, K120ND has an especially good rating. Inflated Parison Test (Sn-Stabilised) Dispersion Rating Low Shear High Shear K120N 8 4 K120ND 3 1 Test rating 0-12 where 0 = gel-free/excellent dispersion 12 = sandpaper/high gel content Extrusion conditions: Bekum BA 07 Low shear terni temperature ( C): - Cylinder 180, 170, 150, 170, Die head 180, 180 High shear temperature ( C): - Cylinder 175, 160, 150, 165, Die head 175, 180 Screw speed (RPM) 75 Sn Formulation S PVC K Sn mercaptide stabiliser 1.5 Fatty acid of polyol 0.5 Epoxidised soya bean oil Dioctyl phthalate 5.0 Organoleptic Properties (Ca/Zn-Stabilised) PARALOID K120N and K120ND processing aids used in Ca/Zn-stabilised formulations for food products, such as water bottles, have a negligible effect on taste. In the following test, bottles made with a formulation including the PARALOID processing aids are filled with mineral water, which is then compared to the same mineral water in glass bottles.

8 Dimensional Control The addition of PARALOID K120N processing aid gives better control of wall thickness in extruded profile and pipe. This better control increases efficiency and output, and thereby reduces production costs. The results in the following tables were obtained from one-month extended trials producing large pipes of various diameters and wall thicknesses. Wall Thickness Variations Without Processing Aid K120N, 0.4 phr K120ND, 0.8 phr Wall thickness variation (%) Wall thickness range (%) Variation from nominal thickness (%) Wall Thickness and Output Variations Pipe Production, Wall Thickness Without Processing Aid K120N, 0.8 phr Minimum - maximum (mm) 5.15 to to 4.50 Range (mm) Thickness variation (%) Variation from nominal thickness (%) Pipe Output Metres/hour Kg/hour Pipe Weight Kg/metre - measured Definitions: Thickness variation is the percentage variation of the maximum and minimum above and below the average. Wall thickness range is the percentage variation of the minimum below the maximum. This is the factor often used in the pipe industry to record control of wall thickness. Variation from nominal thickness is the percentage difference between the average thickness and the nominal wall thickness. It emphasises how much the pipe dimension is over and under the nominal size. Standards and Formulations Test Standards and Descriptions Test Optical Yellowness index Standard ASTM-D ASTM-D Inflated Parison Test In this test, the parison is extruded vertically from the Bekum die to the floor. The hot parison is then squeezed between two vertical plates and allowed to cool. The cold parison is removed from between the plates and cut carefully into 10-cm segments. Each segment is weighed and plotted against the parison length. The segment weights are plotted back to the zero length, to give the weight/cm of the first part of the parison exiting the Bekum die.

9 The die swell is calculated as the ratio of the zero-length weight of the parison with processing aid to the zerolength weight of the parison without processing aid. Rheotens Extensiometer The Rheotens Extensiometer is an instrument designed to measure elongation and stress of polymer melts. The Rheotens Extensiometer is comprised of an extrusion gear assembly, a programmer, and a chart recorder. The programmer is used to control the speed and acceleration of two cogged wheels in the extrusion gear assembly. The polymer melt strand is passed between the two cogged wheels, and the chart recorder records the force and velocity. The operator first sets the speed and acceleration, typically to the same linear speed as the extrudate, and then places the polymer melt strand between the two cogged wheels. The speed is then increased, and the resulting elongation and stress can be charted. Recommended Formulations Corrugated Land Drainage Pipe S PVC K Tri-basic Pb sulphate 1.00 Di-basic Pb stearate 1.25 Calcium stearate 1.00 Stearic/Palmatic acid 0.30 High molecular weight paraffin wax 0.20 Glycerol mono-stearate 0.40 CaCO Pigment as required PARALOID K120N processing aid 2 to 3 Calendered Film and Sheet S PVC resin K PARALOID BTA 736-S 6.0 PARALOID K120N 1.0 PARALOID K Di-n Octyl-Sn mercaptide stabiliser 1.0 Glycerol mono-oleate 1.0 Ester of montanic acid with ethylene glycol 0.4 Blue toner Violet toner 0.011

10 Cosmetics and Toiletries Bottle S PVC resin K PARALOID BTA 736-S 7.0 PARALOID K120N 1.2 PARALOID K Di-n Octyl-Sn mercaptide stabiliser 1.3 High molecular weight complex 0.4 fatty acid ester with calcium Polar polyethylene wax 0.25 Tri glycerol ester of hydroxy 1.2 saturated fatty acid Blue toner Violet toner 0.01 Rohm and Haas Company makes no warranties, either expressed or implied, as to the accuracy or appropriateness of this data and expressly excludes any liability upon Rohm and Haas arising out of its use. We recommend that the prospective users determine for themselves the suitability of Rohm and Haas materials and suggestions for any use prior to their adoption. Suggestions for uses of our products or the inclusion of descriptive material from patents and the citation of specific patents in this publication should not be understood as recommending the use of our products in violation of any patent or as permission or license to use any patents of the Rohm and Haas Company. Material Safety Data Sheets outlining the hazards and handling methods for our products are available on request. PARALOID is a registered trademark of Rohm and Haas Company/Philadelphia (USA). Rohm and Haas, 2007 All rights reserved. January 2003 PAER.TDS/AIM/K120N-K120ND/ENG/JAN.03