Clariant Pigments WARPAGE

Transcription

1 Clariant Pigments WARPAGE Public Business Unit Pigments

2 2 Warpage and Shrinkage Unexpected shrinkage and warpage may be caused by organic pigments. The right pigment selection can prevent those effects and customer complaints. SHRINKAGE = geometric reduction in the size of a part. The part becomes smaller. WARPAGE (DISTORTION) = results when shrinkage is not uniform. The part becomes deformed.

3 l 3 Shrinkage Geometric reduction in the size of a part 60 b vertical The part becomes smaller. 60 horizontal 2,5

4 4 Shrinkage Examples for rotational symmetric applications Caps/ Closures Rotational moulded cases Pipes

5 5 Warpage During injection molding process of HDPE, organic pigments have an influence on crystallization behavior of the polymer. A number of studies have shown that pigments can affect both: the size of the crystallites and the rate of crystallization by acting as nucleating agents. In result organic pigments induce crystallization at higher temperatures than expected.

6 6 Warpage

7 7 Warpage test method In the first step 10 HDPE injection molding plates with a size of 60 x 60 mm are produced. In the second step 10 HDPE plates the same size colored with 0.1% organic pigment are made up. Processing temperature depending on the pigment stability is 220 C and 280 C. With a special device the vertical and horizontal length of each plate is measured. Result is given as: Difference of the vertical and horizontal change between test plates in natural HDPE and those ones colored with 0.1% pigment is calculated and a warpage category is assigned.

8 8 Hostalen GC Test plates

9 9 PV Fast Red HGR 10 Test plates

10 10 Special device for measurement

11 11 Warpage category assessment ( % S vertical -% S horizontal ) % FV = x 100 % S horizontal FV = Shrinkage % S length = Vertical shrinkage in % vs. natural material % S width = Horizontal shrinkage in % vs. natural material Warpage class 1: FV = 0-10 % Warpage class 2: FV = % Warpage class 3: FV = > 20 % excellent suitable, pretests are necessary unsuitable

12 l 12 Warpage If the vertical shrinkage is higher than the horizontal shrinkage, the warpage result has a positive sign. 60 b vertical 60 horizontal 2,5 Warpage Horizontal (%) Vertical (%) Total (%) PV Fast Red HGR 2,90 3,03 1,10

13 l 13 Warpage If the horizontal shrinkage is higher than the vertical shrinkage, the warpage result has a negative sign. 60 b vertical 60 horizontal 2,5 Warpage Horizontal (%) Vertical (%) Total (%) PV Fast Yellow H9G 2,87 2,84-2,24

14 14 Warpage Examples for critical applications Bottle crates Pallets Containers Boxes Trays

15 15 Clariant s low warping pigments range Pigment Color Index Warpage class PV Fast Yellow H9G P.Y PV Fast Yellow H4G P.Y PV Fast Yellow H2G P.Y PV Fast Yellow HG/ HG 01 P.Y PV Fast Yellow H2GR P.Y PV Fast Yellow HGR P.Y Graphtol Yellow H2R P.Y PV Fast Yellow H3R P.Y PV Fast Orange H4GL 01 P.O.72 1 PV Fast Orange H2GL P.O.64 2 PV Fast Orange 6RL P.O.68 1 Graphtol Red HFG P.O.38 2 PV Fast Red HGR P.R Graphtol Red LG P.R.53:1 2

16 16 Clariant s low warping pigments range Pigment Color Index Warpage class Graphtol Red F3RK 70 P.R PV Fast Red HB P.R Graphtol Fire Red 3RLP P.R.48:3 1 Graphtol Red F5RK P.R Graphtol Red P2B P.R.48:2 1 PV Fast Red HF4B P.R Graphtol Carmine HF4C P.R PV Fast Red E4G P.V.19 1 Graphtol Carmine HF3C P.R PV Fast Red E3B P.V.19 2 PV Fast Red E5B P.V.19 2 PV Fast Pink E P.R PV Fast Pink E 01 P.R PV Fast Violet ER P.V.19 2

17 17 Clariant Disclaimer This information corresponds to the present state of our knowledge and is intended as a general description of our products and their possible applications. Clariant makes no warranties, express or implied, as to the information s accuracy, adequacy, sufficiency or freedom from defect and assumes no liability in connection with any use of this information. Any user of this product is responsible for determining the suitability of Clariant's products for its particular application. Nothing included in this information waives any of Clariant s General Terms and Conditions of Sale, which control unless it agrees otherwise in writing. Any existing intellectual/industrial property rights must be observed. Due to possible changes in our products and applicable national and international regulations and laws, the status of our products could change. Material Safety Data Sheets providing safety precautions, that should be observed when handling or storing Clariant products, are available upon request and are provided in compliance with applicable law. You should obtain and review the applicable Material Safety Data Sheet information before handling any of these products. For additional information, please contact Clariant. For sales to customers located within the United States and Canada the following applies in addition NO EXPRESS OR IMPLIED WARRANTY IS MADE OF THE MERCHANTABILITY, SUITABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE OF ANY PRODUCT OR SERVICE. 9/2010 Product and service marks protected by Clariant in many countries * Product and service marks licensed by Clariant in many countries 2013 Clariant International Ltd, Rothausstrasse 61, 4132 Muttenz, Switzerland