Blending Resins: A Powerful Component in Paste Formulations Dr. Andreas Winter Vinnolit GmbH & Co. KG, Burghausen, Germany

Transcription

1 Blending Resins: A Powerful Component in Paste Formulations Dr. Andreas Winter Vinnolit GmbH & Co. KG, Burghausen, Germany Seite 1

2 Content What is a blending (extender) resin? Benefits of extender resins Differences between the grades Examples for high performance grades Seite 2

3 What is a blending resin? Blending resins (extender resins) are used in the paste formulation partially replacing the normal paste resin: Paste resin X Extender resin X Plasticiser Stabiliser X = parts Seite 3

4 Classes of paste PVC Suspension polymerisation: Extender resin Intense stirring (has influence on particle size distribution) Suspension aid Initiator soluble in VCM Particle size: about 30 μm Reaction of liquid VCM in Water Special micro-s-polym.: Paste resin Homogenising of VC with pressure (defines particle size) Emulsifier Initiator soluble in VCM Particle size: about 3 μm (Vinnolit) Emulsion polymerisation: Paste resin Emulsifier Slow stirring Initiator soluble in water Particle size: 0,1 some μm in loose agglomerates 10 μm 1 μm 1 μm Seite 4

5 Agglomerate of primary particles Primary particles 10 μm 1 μm 10 μm Seite 5

6 Positive effects of extender resin 1. Extender resins reduce viscosity and minimize unwanted flow characteristics of plastisols (like dilatancy). Thus they allow higher production speed, easier handling or, on the other hand, reduction of plasticiser or other liquid components in the formulation. 2. Extender resins generally improve special handling properties like deaeration behaviour and viscosity increase during storage of the plastisol. 3. Extender resins can be used to regulate the surface gloss of the finished product. Seite 6

7 Action of extender resin 1. Viscosity Viscosity with and without standard extender resin (log scale) Viscosity [mpa*s] Paste resin (35 phr Plasticiser) Paste resin : Standard extender resin 90:10 Paste resin : Standard extender resin 70: Shear Rate [1/s] Seite 7

8 Action of extender resin 1. Viscosity Extender resin compensates lower plasticiser dosage 100 Viscosity [Pa*s] 10 1 Paste resin (60 phr DINP) Paste resin with 30 phr extender resin (50 phr DINP) Paste resin (50 phr DINP) 0 0, Shear rate [1/s] Seite 8

9 Viscosity [mpa*s] Action of extender resin 1. Viscosity Difference in viscosity between standard and special extender resin (log scale) Paste resin (35 phr Plasticiser) Paste resin : Standard extender resin 80:20 Paste resin : Special extender resin 80: Shear Rate [1/s] Seite 9

10 Action of extender resin 2. Matting effect C 195 C 35 Gloss (60 ) Semi matt paste resin 10 phr extender resin (C 66 W) 30 phr extender resin (C 66 W) 30 phr special matting e.r.(c 100 V) Seite 10

11 Side effects of extender resin Impact on mechanical properties Tear propagation resistance [N/mm] C 195 C Paste resin 30 phr standard extender resin 30 phr special extender resin (C 66 W) Seite 11

12 Side effects of extender resin Impact on mechanical properties Fracture surface Standard extender resin with average bonding to the PVC-Matrix Special extender resin (e.g. C 66 W) with optimal bonding to the PVC-Matrix Seite 12

13 Copolymeric extender resins Fusion enhancement Pastenlabor Burghausen RHEOLAB - GELIERUNG Viskosität [Pas] Legende Gelierstart Temp. [ C] Ansatz 77.4 E70TT:C65V 60T DINP Viscosity [Pa*s] E70TT:C12/62V 60T DINP (40 phr) AW [ C] Temperature Gamma: 1 Frequenz: 5 Hz Aufheizen: 2 C/min 8165 Seite 13

14 Tear propagation resistance [N/mm] 90,0 80,0 70,0 60,0 50,0 40,0 30,0 20,0 10,0 Copolymeric extender resins Fusion enhancement Copolymeric blending resin (here C 12/62 V) standard blending resin 0, Gelation temperature [ C] Seite 14

15 Conclusions Extender resins decrease the paste viscosity and suppress flow anomalies like dilatancy. This allows a lower plasticiser dosage. Extender resins increase the matt effect of the surface. The strength of these effects depend on the grades used. Special grades perform better than standard grades. Extender resins can have influence on the mechanical performance, special grades avoid this. Copolymeric extender resins have additional effect, they accelerate the fusion of the paste. Seite 15