Technical Bulletin Talc in Plastics

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1 Technical Bulletin 131 Talc in Plastics

2 Contents Introduction Benefits of Talc in Polypropylene Compounds 1. Stiffness (E-Modulus) 2. Thermal Conductivity 3. Nucleation 4. Impact Strength 5. Deflection Temperature 6. Creep Resistance 7. Barrier Properties 8. Chemical Resistance New Markets for Talc-Filled Polymers Introduction Pure talc, the softest of all minerals with a Mohs hardness of 1, is an organophilic, water repellent and chemically inert mineral. It is characterized as a hydrated magnesium sheet silicate with the formula Mg 3 Si 4 O 1 (OH) 2. Talc consists of a layer or sheet of brucite (Mg(OH) 2 ) sandwiched between two sheets of silica (SiO 2 ) (see figure 1). Weak Van der Waal s forces bond the crystal lattice of talc. Thus, talc undergoes cleavage very readily, is very soft and has a soapy feel. The term talc covers a wide range of natural products. Impurities commonly encountered include magnesite (magnesium carbonate), calcite, quartz and chlorite (a mix of Mg- Al- and Fe- silicate / Mg(OH) 2 ). Among the different modifications of talc, mostly pure and lamellar talc grades are used in the plastic industry. Talc is usually lamellar (platy), but the aspect ratio can vary considerably. Its high aspect ratio is the most important property for its use in plastics. Talc is a functional component in paper, paints, plastics, rubbers, ceramics, fertilizers, animal feed, cosmetics, pharmaceuticals and other applications. In plastics, it is used to stiffen thermoplastics, mainly polypropylene but also polyethylene and polyamide (nylon). Main applications are automotive parts, household appliances and engineering plastics. Figure 1: Talc crystal structure Si O OH Mg 2 Mondo Minerals B.V. Technical Bulletin 131

3 Benefits of Talc in Polypropylene Compounds 1. Stiffness (E-Modulus) The main reason for incorporating talc in plastics is to increase the stiffness (E-modulus). The degree of rigidity depends on the filling level, aspect ratio and fineness of the talc (Figure 1). Tensile modulus (MPa) Stiffness and Aspect Ratio High aspect ratio talc Medium aspect ratio talc Calcium carbonate Figure 1: Stiffness of a PP compound with high aspect ratio talc, a mineral with medium aspect ratio, and calcium carbonate Mineral loading (wt%) 2. Thermal Conductivity Because of talc s significantly higher thermal conductivity (compared to the polymer), the heat introduced and generated during processing is transmitted through the mixture more quickly (Figure 2). The heat is also transported out of the compound faster during cooling. Incorporating talc in a compound increases the thermal conductivity, resulting in faster production rates. Experience with filled polymers is that conductivity depends only on the filler content, within reasonable tolerances. Thermal Conductivity of PP Compounded with Talc Thermal conductivity (W/m K),55,5,45,4,35,3, Fine medium aspect ratio talc Medium lamellar talc Fine lamellar talc Figure 2: Thermal conductivity of PP/talc Mineral loading (wt%) Mondo Minerals B.V. Technical Bulletin 131 3

4 3. Nucleation The crystallization of polypropylene is promoted by small amounts of preferably fine talc, which acts as a nucleating agent. Crystallization starts at a higher temperature in the presence of talc, compared to unfilled PP. The impact strength is improved (Graph 3) but this is primarily due to an increase in the crystallization of the PP and not the mechanical properties of the talc itself. There is also a change in modulus (Figure 4) as a result of the change in crystallinity. Nucleation of PP: Impact Strength Nucleation of PP: E-modulus Figures 3 and 4: Impact and rigidity of nucleated PP Charpy Impact Strength (kj/m 2 ) Loading (wt%) Flexural Modulus (N/mm 2 ) Loading (wt%) Talc Sodium benzoate Ca-carbonate Talc Sodium benzoate Ca-carbonate 4. Impact Strength Addition of mineral fillers will not generally improve impact strength. There are exceptions, for example the use of fine talc in PP compounds for car bumpers. In the latter case, 5 to 1 % of fine talc is added. Impact strength decreases at higher loadings (Figure 5). Figure 5: Influence of fine talc on high impact PP Flexural Modulus (MPa) Impact Strength and Rigidity of Talc/PP compounds Impact Strength (kj/m 2 ) Talc loading (wt%) 4 Mondo Minerals B.V. Technical Bulletin 131

5 5. Deflection Temperature In many applications such as in plastic parts for cars or packaging, rigidity is required at elevated temperatures. The heat distortion temperature (HDT) can be used to demonstrate how a mineral influences the stiffness of a plastic compound at elevated temperatures. Lamellar talc with high aspect ratio improves the deflection temperature of polyolefins to a greater extent than talc with a lower aspect ratio (Figure 6). Impact Strength and Rigidity of Talc/PP Compounds Deflection Temperature ( C) PP 19 PP + 2 % medium talc I 121 PP + 2 % medium talc II 14 PP + 4 % medium talc II Figure 6: Deflection temperature of compounds with medium aspect ratio talc (I), high aspect ratio talc (II) and unfilled PP 6. Creep Resistance Substantial reduction of creep is achieved with filled polymers in comparison to unfilled ones. Best results in our creep tests were obtained with fine platy talc. Various fillers and filler combinations reduced creep as follows: High aspect ratio talc > medium aspect ratio talc > blend of talc and carbonate > calcium carbonate > unfilled polypropylene (Figure 7). Long-term Creep of PP and PP Compounds with Talc and Calcium Carbonate PP PP + 2 % Calcium carbonate Figure 7: Creep of PP and filled polypropylene Strain (%) PP + 2 % Lamellar talc PP + 4 % Medium aspect ratio talc PP + 3 % Lamellar talc 2 4 Time (years) Mondo Minerals B.V. Technical Bulletin 131 5

6 Information obtained from short-term tests of PP can be extrapolated to predict properties over a longer period of time at a constant temperature The conventional short-term modulus is replaced in formulas by the creep modulus. The creep modulus, which is important for expected service life under load, can be calculated from creep tests. The figure below applies to a fiveyear period (Figure 8). Typical products where creep has to be taken into consideration are buried plastic pipes (e. g. for sewage water). Creep Modulus of PP and PP Compounds Figure 8: Creep modulus (for five years) Creep Modulus (N/mm 2 ) PP PP + 2 % PP + 2 % Calcium Talc/ Carbonate Carbonate (1:2) PP + 2 % Talc PP + 3 % Talc 7. Barrier Properties Water vapor and oxygen transmission are important factors to control in food packaging. They directly influence the shelf life of the food contained inside. Talc provides the opportunity to reduce transmission rates for water vapor (Figure 9) and oxygen (Figure 1). The lamellar talc particles are mostly orientated in films and will constrain the water vapor and oxygen on its way through the packaging. Water Vapor Transmission Rate Figure 9: Water vapor transmission rate Water vapor transmission g/(m 2 x24h) PPH PPH + 3%talc d5=3.µ PPH + 3%talc d5=2.1µ PPH + 3 % Ca-carbonate Reduced water vapour transmission in polyolefin food packaging by talc 6 Mondo Minerals B.V. Technical Bulletin 131

7 Oxygen Transmission Rate Oxygen transmission cm 3 /(m 2 x24h) PPH PPH + 3%talc d5=3.µ PPH + 3%talc d5=2.1µ Reduced oxygen transmission in polyolefin food packaging by talc PPH + 3 % Ca-carbonate Figure 1: Oxygen transmission rate 8. Chemical Resistance Talc is water repellent and chemically inert. This is very important for the direct contact of mineral filled packaging material with food-stuffs. Migration tests are done with different simulants (distilled water, 3 % acetic acid, 1 % ethanol and rectified olive oil). Even with 3% acetic acid, overall migration requirements can be fulfilled (< 1mg/dm 2 sample). (Figure 11) EN : Test methods for overall migration from plastics into aqueous food simulants by cell. Simulant 3 % acetic acid Test conditions 1 days, 4 C The overall migration limit is 1 mg/dm2 Sample PP homopolymer + 3% Ca-carbonate (EXH1 SP) PP homopolymer + 3% Talc d5 = 3. µm.4 1. Overall migration mg/dm 2 sample Figure 11: Overall migration of PP/Talc, simulant 3 % acetic acid New Markets for Talc-Filled Polymers The automotive and domestic appliances markets are still the dominating users of talc-filled compounds, but new markets are being developed. Their growth depends partly on the extent to which end-users actively seek alternative materials to PVC and PS. Markets of interest here include profiles, pipes and food packaging. In replacement of PVC for plastic pipes, there is a need to compensate for the lower ring stiffness of polyolefins, but also to reduce undesirable long-term properties of unfilled polypropylene and polyethylene, such as their tendency to creep (deform under long-term strain). Talc is the preferred additive in this application, as it imparts high stiffness, which allows a reduction in wall thickness. Impact resistance at sub-zero temperatures is unimpaired. Talc-filled polypropylene is also finding new markets in food packaging applications. Migration requirements according to EN can be met, and higher rigidity and barrier properties (e.g. reduction of oxygen permeability) are imparted. Talc improves output in extrusion and shortens cycle times in thermoforming, due to crystallization and better heat transfer. These benefits make talc compounds very competitive for food packaging, so there is considerable potential in this application. Mondo Minerals B.V. Technical Bulletin 131 7

8 W E TALK TALC Mondo Minerals B.V. Kajuitweg 8 NL -141 AR Amsterdam Phone Fax info@mondominerals.com The information contained in this Technical Bulletin relates only to the specific tests designated herein and does not relate to the use of our products in combination with any other material or in any process. The information provided herein is based on technical data that Mondo Minerals believes to be reliable, however Mondo Minerals makes no representation or warranty as to the completeness or accuracy thereof and Mondo Minerals assumes no liability resulting from its use for any claims, losses, or damages of any third party. Recipients using this information must exercise their own judgement as to the appropriateness of its use, and it is the user s responsibility to assess the materials suitability (including safety) for a particular purpose prior to such use.

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