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1、INTERNATIONAL STANDARD IS0 1600 Second edition 1990-I 2-01 Plastics - Cellulose acetate - Determination of light absorption on moulded specimens produced using different periods of heating Piastiques - Acetate de cellulose - D it shall be ground if necessary, avoiding excessive heating of the sam- p
2、le. If proceeding in accordance with 7.1.2 (second method of incorporating the plasticizer), the cellu- lose acetate need not be ground. 6.2 Determine the moisture content of the sample In accordance with IS0 585. 7 Procedure 7.1 Either of the methods described below may be used for the incorporatio
3、n of plasticizer. 7.1.1 First method Weigh into a glass bottle, to within + 0,5 g, the quantity of the sample corresponding to 100 g of dry cellulose acetate. Into another glass bottle, weigh 45 g of dimethyl phthalate (4.1), to within + 0,5 g. Slowly add the dimethyl phthalate to the cellulose acet
4、ate with constant stirring and continue to stir for at least 5 min after all the dimethyl phthalate has been added. Proceed in accordance with 7.2 to 7.9. 7.1.2 Second method Place 200 g, weighed to the nearest 1 g, of the cellulose acetate in a 2 litre vessel. The moisture content of the sample sha
5、ll be less than 0,5 %;- if not, there is a risk of bubbles forming in the mould- ing. Add about one-half of the following mixture: - dimethyl phthalate (4.1): 75 ml t- 0,5 ml (90 g - propan-2-01 (4.5): 400 ml ) 0,5 ml. Homogenize by mixing briskly with a glass stirrer. Pour in the rest of the solven
6、t/plasticizer mixture, and, after having mixed again and stoppered the vessel, place it immediately on a roller mixer oper- ating between 50 rpm and 70 rpm. After 2 h of mix- ing, tap the vessel with the palm of the hand in order to dislodge any powder which may have become 2) Chance 0-B. IO and llf
7、ord 608 are examples of suitable products available commercially. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by IS0 of these products. 2 Copyright International Organization for Standardization Provided by IHS under li
8、cense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:08:48 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1600:1990(E) stuck to the sides. Place on the roller mixer again and mix for a further 4 h. Pour the product into a porcelai
9、n dish, cover with a sheet of filter paper and let it stand in the open, at room temperature, overnight. Then place in an oven, thermostatically maintained at 60 “C + 2 “C, and leave for 3 h to eliminate part of the solvent. At the end of this time, place the product in the original clean vessel aga
10、in. Homogenize it for one or two minutes, by rapid mixing with a mixing rod equipped with a blade turning at 10000 rpm. (This operation is to destroy any agglomerates that may have been produced during the stoving.) Stopper the vessel, then let it stand again at room temperature for about 20 h. Proc
11、eed in accordance with 7.2 to 7.9. triacetin (4.2), ethyl lactate (4.3) and acetone (4.4) leaving for a few minutes till tacky, then applying a second layer of cement and bonding the pieces to- gether under slight pressure between polished plates in a press, using a jig to hold the pieces in positio
12、n without slipping. 7.8 Measure the optical densities of each test specimen for red light and for blue light, using the photoelectric absorptiometer and filters (5.3), pref- erably immediately after moulding and specimen preparation (if this is not possible, the mouldings or test specimens shall be
13、kept in the dark until the measurements can be made). 7.9 Measure the average thickness of each test specimen in the region traversed by the light beam. 7.2 Heat the mixed material for 2 h at 70 “C + 2 “C to remove moisture and complete the absorption of plasticizer. 8 Expression of results 7.3 Plac
14、e a suitable quantity of the heated mixture in the mould (5.2), pre-heated to a temperature of 200 “C + 2 “C. Apply contact pressure for 2 min, then full pressure (at least 6 MN/m* at the moulding surface) for a further 10 min +_ 0,5 min for a mould- ing I,5 mm thick. This time shall be increased by
15、 0,5 min for each 0,5 mm above 7,5 mm thickness, 8.1 The initial light absorptions and the light ab- sorptions after further heating, expressed as the optical density D at 25 mm thickness, are calculated using the equation D, - 0,03 D=25x d 7.4 Release the pressure and start cooling im- mediately, c
16、ontinuing the cooling until the moulding is rigid enough to be ejected without being de- formed. The rate of cooling shall be such that the mould temperature 2 min after the start of cooling is at least 30 “C below the moulding temperature. where Qll is the.measured optical density; d Is the thickne
17、ss, in millimetres, of the test specimen. 7.5 Prepare a further moulding of the same thick- ness in a similar manner, but with a heating time, at full pressure, one-third of that used in 7.3. 7.6 For the measurement of the optical density, prepare two test specimens from each nioulding as described
18、in 7.7. 7.7 The test specimen thickness shall not exceed 13 mm, and should preferably be such that the measured optical density is not less than 0,06. With material of good colour, the measured optical den- sity at the red end of the spectrum may be less than 0,06 even with a thickness of 13 mm. The
19、 required thickness may be obtained by laminating together two or more pieces cut from a moulding, without using heat or impairing the outer polished surfaces. A suitable method is to coat the surfaces to be joined with a cement containing equal volumes of 8.2 For the two test specimens prepared in
20、ac- cordance with 7.5, the mean value of the two results of D for red light is taken as “D red” and the mean value of the two results of D for blue light is taken as “II blue”. Report these as “initial light absorp- tions”. 8.3 For the two test specimens prepared in ac- cordance with 7.2, 7.3 and 7.
21、4, calculate the values for “D red” and “D blue” and report these as “light absorptions after further heating”. 9 Precision The precision of this test method is not known be- cause inter-laboratory data are not available. This method may not be suitable for use in specifications or In case of disput
22、ed results as long as these data are not available. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:08:48 MDTNo reproduction or networking permitted without license from IHS
23、 -,-,- IS0 1600:1990(E) 10 Test report manufacturer s code number, source, trade name, etc.; The test report shall include the following particu- lars: c) the initial light absorptions and the light absorp- tions after further heating; a) a reference to this International Standard; d) the date of th
24、e test, b) all details necessary for the complete identifl- cation of the product tested, including type, Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:08:48 MDTNo reproduct
25、ion or networking permitted without license from IHS -,-,- IS0 1600:1990(E) Dimensions in millimetres la Flat plate, 1,5 mm thick, of stainless steel or nickel-plated steel polished on the lower surface 1 b Stainless-steel moulding template, 1,5 mm to 5 mm thick Ic Flat plate, 1,5 mm thick, of stain
26、less steel or nickel-plated steel polished on the upper surface Figure 1 - Suitable mould (see 5.2) 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:08:48 MDTNo reproduction
27、or networking permitted without license from IHS -,-,- IS0 1600:1990(E) UDC 678.544.4:535.34 Descriptors: plsstlcs, cellulose derivatives, cellulose acetate, tests, determination, absorptlon, light (vlslble radiatlon). Price based on 5 oaaes Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 19:08:48 MDTNo reproduction or networking permitted without license from IHS -,-,-