1、STD-BSI BS EN 12877-1-ENGL 2000 Lb24bb7 0822b7b L3L BRITISH STANDARD Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materials in plastics - Part 1: General introduction The European Standard EN 12877-1: 1999 has the status of a British Stan
2、dard ICs 83.040.30 IS EN .2877-1:2000 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMUTED BY COPYRIGHT LAW STD-BSI BS EN 12877-1-ENGL 2000 m Lb24bb7 0822b77 078 m BS EN 12877-1:2000 Amd. No. This British Standard, having been prepared under the direction of the Sector Committee for Materials and Ch
3、emicals, was published under the authority of the Standards Committee and comes into effect on 15 January ZOO0 Date Comments O BSI 01-ZOO0 National foreword This British Standard is the English language version of EN 12877-1: 1999. The UK participation in its preparation was entrusted to Technical C
4、ommittee SW1, pigments, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related internationai and European developments and promulgate interpretation, or proposals for change, and keep the UK inte
5、rests informed; them in the UK, A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publidom referred to in this document may be found in the BSI Standards Catalogue under
6、the section entitled “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a conxact. Users of British Standards are responsible for their correct appli
7、cation. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when th
8、e document was last issued. Amendments issued since publication ISBN O 580 35860 7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12877-1 October 1999 ICs 83.040.30 English version Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materi
9、als in plastics - Part I : General introduction Matires colorantes dans les plastiques - Dtermination de la stabilit de la couleur a la chaleur au cours de la mise en oeuvre des matires colorantes dans les plastiques - Partie 1: Gnralits Farbmittel in Kunststoffen - Bestimmung der Bestndigkeit der F
10、arbe gegen Hitze beim Verarbeiten von Farbmitteln in Kunststoffen - Teil 1: Allgemeine Einleitung This European Standard was approved by CEN on 5 September 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard
11、 the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, Ger
12、man). A version in any other language made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie oficial versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Fi
13、nland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brus
14、sels Q 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12877-1:1999 E Page 2 EN 12877-1 1999 Foreword This European Standard has been prepared by Technical Committee CENiTC 298, Pigments and extenders, the Secretariat of which
15、 is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2000, and conflicting national standards shall be withdrawn at the latest by April 2000. Annex A (informative) describes a ge
16、neral method for preparing test specimens having standard depth of shade and annex B (informative) comprises tables listing the coefficients required in the calculations. According to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to i
17、mplement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction This is one of a number of parts of EN 12877 dealing with
18、methods for determining the colour stability of colouring materials under the influence of the thermal stress encountered during plastics processing. In this context, the common expressions “heat stability” and “heat resistance” are widely used. Colour changes may occur during processing not only be
19、cause of thermal degradation of colouring materials and of plastics but also as a result of other changes to them, e.g. solubility in the polymer, changes in dispersion level, recrystallization or crystal modification, and from other complex interactions with the polymer itself or other additives pr
20、esent. Colour stability during processing is one of the most important performance criteria required by the processor of coloured plastics materials. However, absolute values for colour stability of colouring materials during processing cannot be established. The test methods described in EN 12877 a
21、llow appropriate procedures, conditions and determination criteria to be agreed upon according to the plastics material to be coloured and the processing method. The resulting comparative data is useful in colouring material selection and also in determining their processing stability in the end-use
22、 polymer under practical processing conditions. The term colouring material as used here includes single pigments, dyestuffs and extenders as well as products produced from them such as masterbatches, colour pastes, pigment blends and other pigment preparations designed for use in plastics materials
23、. 1 Scope This part of EN 12877 gives a general introduction to the most widely used methods for determination of colour stability during processing of colouring materials in plastics under the influence of heat. It also specifies those details which are common to the various test methods described
24、in subsequent parts of EN 12877. The choice of the test method depends on the plastics material to be coloured, the method of processing and the end-use requirements. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These n
25、ormative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated r
26、eferences the latest edition of the publication referred to applies. EN 12877-2 Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materials in plastics - Part 2: Determination by injection moulding EN 12877-3 Colouring materials in plastics -
27、Determination of colour stability to heat during processing of colouring materials in plastics - Part 3: Determination by oven test BSI 01-2000 STD-BSI BS EN 12877-1-ENGL 2000 Lb2qbb7 0822b80 bb2 Page 3 EN 12877-1 1999 EN 12877-4 Colouring materials in plastics - Determination of colour stability to
28、 heat during processing of colouring materials in plastics - Part 4: Determination by two-roll milling Textiles - Tests for colour fastness - Part A02: Grey scale for assessing change in colour EN 201 05-AO2 (IS0 105-A02:1993) IS0 842 Raw materials for paints and varnishes - Sampling IS0 7724-2 1 98
29、4 IS0 7724-3 Paints and varnishes - Colorimetry - Part 2: Colour measurement Paints and varnishes - Colorimetry - Part 3: Calculation of colour differences 3 Terms and definitions For the purposes of this standard the following definitions apply. colour stability the resistance to colour change of a
30、 standardized test material prepared from the colouring material to be tested and a plastics material, when subjected to heat under defined test conditions. NOTE 1 For the colour stability under the influence of heat the expressions “heat stability” and ”heat resistance” are widely used. NOTE 2 A ch
31、ange of properties of the test specimens other than colour under the effect of heat is not taken into account in this European Standard. 4 Apparatus Test apparatus includes a screw injection moulding machine with screw ram (EN 12877-2), a drying oven with forced air ventilation (EN 12877-3) and a la
32、boratory two-roll mill (EN 12877-4). 5 Sampling Representative samples of the colouring materials to be tested shall be taken as described in IS0 842. 6 Test specimens The colouring material shall be tested in reduced shade (6.1) and/or in full shade (6.2). 6.1 For testing in reduced shade, 1 % of t
33、itanium dioxide pigment shall be added to the plastics material, unless otherwise specified or agreed. The concentration of the colouring material shall correspond to: a) 113 standard depth of shade (SD) (see annex A), or b) 1/25 standard depth of shade (SD) (see annex A), or c) an agreed reduction
34、ratio of colouring material to titanium dioxide. For a test specimen of 1 mm thickness 5 % titanium dioxide pigment is necessary to obtain full hiding. 6.2 For testing in full shade, the concentration of the colouring material in the test medium shall correspond to 6.1 a). Alternatively, a concentra
35、tion of 0,l % (preferred for organic pigments and dyestuffs), or 2 % (preferred for inorganic pigments) or another agreed appropriate concentration shall be taken. The preparation of test specimens for the particular test methods for heat stability is described in EN 12877-2, EN 12877-3 and EN 12877
36、-4 respectively. QBSI 01-2000 STD-BSI BS EN 12877-1-ENGL 2000 lb24bb7 0822b81 5T7 Page 4 EN 12877-1 1999 7 Procedure 7.1 Determination by injection moulding Test specimens are obtained by injection moulding of the coloured plastics material. A specimen prepared at a low processing temperature at the
37、 usual dwell time is used as the reference specimen. Then, the processing temperature is increased in intervals. At the higher processing temperatures, the dwell time is prolonged. For details see EN 12877-2. The colour properties of the prepared test specimens are assessed in accordance with 7.4. 7
38、.2 Determination by oven test Test specimens are subjected to specified or agreed test temperatures during specified or agreed test periods. A specimen which is kept at room temperature is used as the reference specimen. For details see EN 12877-3. The colour properties of the prepared test specimen
39、s are assessed in accordance with 7.4. 7.3 Detemination by two-roll milling The coloured test mixture is milled at a specified or agreed roll surface temperature during specified or agreed test periods. Afier the specified or agreed test periods, test portions are taken from the milled sheet from wh
40、ich specimens suitable for colour measurement are prepared. A specimen obtained from the test mixture after treatment under the usual processing conditions is taken as the reference specimen. For details see EN 128774. The colour properties of the prepared test specimens are assessed in accordance w
41、ith 7.4. 7.4 Evaluation of colour difference The resuiting colour differences shall be either determined in accordance with IS0 7724-2 and IS0 7724-3, or assessed using the grey scale specified in EN 20105-AO2. The colour properties of the uncoloured plastics material, determined by using the same p
42、rocedure with and without adding titanium dioxide pigment, may be taken into account. 8 Expression of results and test report See EN 12877-2, EN 12877-3 and EN 128774 respectively. 9 Precision Statistical data can not be established for the precision of the methods in Parts 2 to 4. Comments, where a
43、ppropriate, are given for each method. QBSI 01-2000 STD.BS1 BS EN 32877-L-ENGL 2000 m Lb2Vbb7 0822b2 Li35 Page 5 EN 12877-1 11 999 Annex A (informative) Preparation of test specimens having standard depths of shade A.l Scope The fastness of colourations depends on their depth of shade. It is therefo
44、re advantageous to carry out tests for fastness properties of colouring materials and systems containing colouring materials at defined depth of shade. In this annex, the 113 and 1/25 standard depths of shade are defined by a formula. In addition, the annex gives information as to how the depth-of-s
45、hade characteristics of coloured specimens are to be determined and how the concentration of the colouring material in a specimen has to be changed so that the required standard depth of shade is obtained. A.2 Definitions For the purposes of this annex, the following definitions apply. A.2.1 depth o
46、f shade a measure for the intensity of a colour perception that increases with increasing saturation and, generally, decreases with increasing lightness. NOTE Colourations having the same depth of shade appear to be prepared by using the same concentrations of colouring materials having the same tin
47、ting strength. In this annex, the relationship between depth of shade and saturation and, respectively, lightness, is defined colorimetrically. A.2.2 standard depths of shade (SD) depth of shade levels laid down by convention NOTE The depth of shade levels 113 and 1/25 have been derived from the dep
48、th of shade levels used in the textiles field. A.3 Standard depths of shade The depths of shade characteristics BlB and Bins for 1/3 and 1/25 SD are given by the following equations (1) and (2) respectively: where: s is the measure for the saturation. It is the linear distance between the chromatici
49、ty coordinates x, y of the specimen and the achromatic point in the chromaticity diagram (basic stimulus E, standard illuminant D65, 1 O“ standard colorimetric observer or respectively, standard illuminant C, 2“ standard colorimetric observer), multiplied by 1 O, .e.: 0BSI 01-2000 Page 6 EN 12877-1 : 1999 C Table A.1 -Values for xo and yo 2“ 0,31 O1 0,3162 I Standard I Standard colorimetric I xo I y, illuminant I observer I I D65 1 O“ I 0,3138 I 0,3310 a(cp) are factors for the evaluation of the saturation measure which depend on both the hue angle cp and the standard depth o
