1、 STDWBSI BS EN IS0 i.lb12-ENGL 1977 I Lb24bb9 08125b9 112 BRITISH STANDARD Plastics - Preparation of PVC pastes for test purposes - Planetary-mixer method The European Standard EN IS0 46121999 has the status of a British Standard ICs 83.08020 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY
2、COPYRIGHT LAW BS EN IS0 4612:1999 - STD-BSI BS EN IS0 4b32-ENGL 3947 3b21ibb9 0832570 934 II BS EN IS0 4612:1999 been prepared under the Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 direction of the Sect
3、or AmdNo. Date O BSI 11-1999 ISBN O 680 36383 4 National foreword Comments This British Standard is the English language version of EN IS0 46121999. It is identical with IS0 46121999. The K participation in its preparation was entrusted to Technical Committee PF/82, Thermoplastic materials, which ha
4、s the responsibility to: - aid enquirers to understand the text, - present to the responsible internaional/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate the
5、m in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists nonnative references to international publications with their correspon
6、ding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “international Standards Correspondence Index“, or by using the “F“ facility of the BSI Standards Electronic Catalogue
7、. A British Standard does not purport to include aii the necessary provisions of a conbract. Users of British Stan- are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. - STD-BSI BS EN IS0 LibLZ-ENGL 1779 I Lb24b
8、bY 0812572 870 9 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 4612 August 1999 ICs 83.080.00 English version Piastics - Preparation of PVC pastes for test purposes - Planetary-mixer method (IS0 461 2: 1999) Plastiques - Prparation des ptes PVC pour essais - MBthodes utilisant un mlangeur
9、 plantaire (IS0 461 2: 1999) Kunststoffe - Herstellung von PVC-Pasten fr Prfzwecke - Planetenmischewetfahren (IS0 461 2:1999) This European Standard was approved by CEN on 23 July 1999. CEN members are bound to comply with the CEWCENELEC Internal Regulations which stipulate the conditions for giving
10、 this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official version
11、s (English, French. Gennan). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cze
12、ch Republic, Denmark. Finland, France, Germany, Greece, Iceland. Ireland. Italy, Luxembourg, Netherlands, Norway, Portugal, Spain. Sweden, Switzerland and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG Central Secretariat: rue
13、de Stassart, 36 E-1050 Brussels Q 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 4612:1999 E STD-BSI BS EN IS0 qbLZ-ENGL 3199 3b24bb9 O32572 707 I EN IS0 4612:1999 Foreword The text of the International Standard IS0 4612:
14、1999 has been prepared by Technical Committee ISOiTC 61 “Plastics“ in collaboration with Technical Committee CENITC 249 “Plastics“, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endor
15、sement, at the latest by February 2000, and conflicting national standards shall be withdrawn at the latest by February 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belg
16、ium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 4612:1999 was approved by CEN as a European Standard wi
17、thout any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). EN IS0 4612:1999 INTERNATIONAL STANDARD IS0 461 2 Second edition 1 999-08- 1 5 Plastics - Preparation of PVC pastes for test purposes - Planetary-mixer method Plastiques - Prparation des
18、 ptes PVC pour essais - Mthode utilisant un mlangeur plantaire Reference number IS0 4612:1999(E) - STD=BSP BS EN IS0 IbLZ-ENGL 3991 Lb24bb9 0832574 58T EN IS0 4612:1999 Foreword IS0 (the Intemational Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member
19、 bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental
20、 and non-governmental, in liaison with ISO, also take pari in the work. IS0 collaborates closely with the International Eiectrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISOAEC Directive
21、s, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Intemational Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 4612 was prepared by Technical Commi
22、ttee ISO/TC 61, Plastics, Subcommittee SC 9. Thermoplastic materials. This second edition cancels and replaces the first edition (IS0 4612:1979), which has been modified to make it suitable for the preparation of pastes of various compositions and to include different types of planetary mixer. ii Pl
23、astics - Preparation of PVC pastes for test purposes - Planetary-mixer met hod 1 Scope This International Standard specifies two methods, A and B, for the preparation of pastes (also known as plastisols) from appropriate PVC resins, plasticizers and other ingredients using a planetary mixing process
24、. Both method A and method B can be used to prepare pastes of any composition. Method A (single-speed) is particularly applicable to resins prone to heat build-up during paste preparation, while method B (two-speed) might be preferred for repetitive work, e.g. for process control during resin manufa
25、cture, because of its shorter mixing time. Such pastes may be used for a variety of test purposes, including the determination of rheological properties for resin designation and specification. 2 Normative reference The following normative document contains provisions which, through reference in thi
26、s text, constitute provisions of this International Standard. For dated references, subsequent amendments or revisions apply. However, parties to agreements based on this Internationai Standard are encouraged to investigate the possibility of applying the most recent edition of the normative documen
27、t indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 291 :1997, Plastics - Standard atmospheres for conditioning and testing. 3 Terms and definitions For
28、the purposes of this International Standard, the following terms and definitions apply. 3.1 paste plastisol a homogeneous dispersion of PVC resin in an organic liquid 3.2 planetary mixer a mixer in which the beater or stirrer not only rotates about an axis within the mixing vessel, but the axis of r
29、otation itself also describes a circular path 4 Principle Liquid plasticizer, PVC resin powder and other appropriate ingredients, in liquid, paste or powder form, are combined in a mixer where the shearing action causes the powder) to disperse in the liquid(s). The paste-making process involves the
30、partial solvation of the resin powder by the plasticizer, and hence the “dispersion“ will remain in liquid form for prolonged periods, .e. the powder does not readily settle out. 1 5 Apparatus and materials 5.1 Planetary mixer, having at least the key features shown in Figure 1, and with a mixing-bo
31、wlheater configuration similar to one of those illustrated in Figure 2. The mixing bowl shall be made of stainless steel and may be fitted with a jacket for the circulation of cooling water. The bowl will have a recommended filling level, stated by the manufacturer. This shall allow the efficient mi
32、xing of 700 g to 1200 g of charge, made up of the relevant proportions of resin, plasticizer and any other ingredients. The motor specified shall have sufficient power to maintain the speed of rotation of the beater around the axis of the bowl at 60 min- f 5 min- and additionally, if method B is use
33、d, at 120 min- f 10 min- with the most viscous paste that it is intended to mix. There will be a fixed relationship between the speed of rotation of the beater around the axis of the bowl and the speed of rotation of the beater around its own axis that will have been set by the manufacturer of the p
34、articular mixer. It shall approximate to the ratio 3:7, .e. when the speed of rotation of the beater around the axis of the bowl is set at 60 min-, the speed of rotation around its own axis will be approximately 140 min-. The mixer may be provided with a rotating wiper to scrape the inside of the bo
35、wl with a blade made of a material that is resistant to the liquid(s) used to make the paste. The mixer may also have facilities for applying a vacuum to the contents of the bowl, both during and after mixing. 5.2 Controlled-atmosphere cabinet or room, capable of maintaining 23 OC f 2 OC and (50 15)
36、 70 relative humidity. 5.3 Balance, accurate to 0,s g. 5.4 Timing device, which indicates seconds. 5.5 Beakers, of different capacities, for containing the test specimens of paste. The beakers shall be big enough to avoid paste overflowing during vacuum de-aeration of the paste. 5.6 Vacuum pump, des
37、iccator, etc., to enable the de-aeration of pastes at a partial vacuum of about 2 x 1 O3 Pa. 5.7 Palette knife. 5.8 Plasticizer. 6 Resin sample and conditioning 1 The resin used to make the paste shall be free from agglomerates and shall be conditioned at 23 OC f 2 “C and (50 k 5) % relative humidit
38、y, in accordance with IC0 291, for 24 h prior to use. 2 7 4 8 i Key 1 Base 2 Mixer 3 4 Feet 5 Stainless-steel bowl 6 7 Beater 8 Main axis of rotation Optional wiper or scraper, rotating to clean inside of bowl Optional jacket for circulation of cooling water Figure 1 - Planetary mixer 3 STD-BSI BS E
39、N IS0 4b42-ENGt 1999 Ibtlibb9 0832.578 125 = EN IS0 4612:1999 .- Dimensions in millimetres o 200 t- o 224 4 Figure 2 - Configurations of typical planetary-mixer bowls and beaters 4 7 Preparation of paste 7.1 MethodA Weigh 100 /O of the calculated quantity of resin into the mixer bowl followed by 100
40、 % of the calculated quantity of plasticizer. The amount of plasticizer is determined both by the paste formulation and by the total quantity of resin, plasticizer and any other ingredients which is necessary to fill the mixer bowl to the level for “efficient“ mixing (see 5.1). Any other powder-form
41、 ingredients should preferably be added as part of the resin system, while other liquid ingredients should be included with the plasticizer. Depending on the amount involved, ingredients in paste form can be added with the powders or with the liquids. Using the palette knife, hand-mix the plasticize
42、r and resin until no free plasticizer can be seen. Scrape the knife clean with the mixer beater to ensure no material is lost. Locate the mixer bowl on the mixer frame, attach the beater to the shaft and raise the bowl or lower the mixer with its beater to the operating position. Start the timer and
43、 the mixer simultaneously, with the beater rotating at 60 min- f 5 min- around the axis of the bowl. After 1 min f 10 s, stop the mixer and timer, take out the bowl and use the palette knife to scrape down the sides of the bowl and the beater. Clean the knife on the beater, put the bowl back and res
44、tart the mixer and timer. After a further 5 min t 15 s, repeat the scrape-down procedure described earlier and then continue mixing until the total actual mixing time reaches 30 min f 30 s. If the mixer is fitted with a rotating scraper for the bowl, it is not necessary to stop mixing in order to sc
45、rape down the sides of the bowl, and mixing shall be allowed to continue uninterrupted for the full 30 min I30 s. If, however, material is noticed adhering to the beater, use the procedure described for mixers having no rotating scraper. Stop the mixer and immediately check the temperature of the pa
46、ste. If the temperature is 35 OC, prepare a new paste either using more plasticizer or, if the mixer bowl is fitted with a cooling jacket, passing cooling water through the jacket. Transfer the paste to suitable beakers. If lumps are visible, prepare a new batch of paste. If not, de-aerate the paste
47、 under a partial vacuum of about 2 x lo3 Pa and maintain this vacuum for about 5 min ater the foam has been observed to collapse. If the mixer has the necessary facilities, the de-aeration procedure may be carried out in the mixer bowl. Cool and store the paste at 23 OC f 2 OC and (50 i 5) % relativ
48、e humidity with the beaker covered to prevent accidental contamination. Take care throughout these procedures to avoid spillage and spattering. 7.2 Method B Weigh 100 % of the calculated quantity of resin into the mixer bowl followed by 100 % of the calculated quantity of plasticizer. The amount of
49、plasticizer is determined both by the paste formulation and by the total quantity of resin, plasticizer and any other ingredients which is necessary to fill the mixer bowl to the level for “efficient“ mixing (see 5.1). Any other powder-form ingredients should preferably be added as part of the resin system, while other liquid ingredients should be included with the plasticizer. Depending on the amount involved, ingredients in paste form can be added with the powders or with the liquids. Using the palette knife, hand-mix the
