《ISO-6836-1983.pdf》由会员分享，可在线阅读，更多相关《ISO-6836-1983.pdf（7页珍藏版）》请在三一文库上搜索。
1、International Standard ( 6836 0 * 4 4Y!li INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEYHAPOflHAR OPAWl3AUHR IlO CTAH/JAPTbl3AUl4lRGANlSATlON INTERNATIONALE DE NORMALISATION a: S” , , ; T ,- ,“ $“, ,I .+, .:,i ), c , _j , I , ;,:,. ! “,i :, :, _ :., Y ,. , ,i* ,y ., ,I?, ,. ,.I : tt Surface activ
2、e agents - Mercerizing agents - Evaluation of the activity of wetting products for mercerization by determination of the shrinkage rate of cotton Agents de surface - Adjuvants de mercerisage - ivaluation de l activith des produits mouillants pour mercerisage par d; ;: ,; i 9 . . iii UDC 661.185.7 :
3、620.1 : 677.017.635 Ref. No. IS0 6836-1983 (E) 8 Descriptors : surfactants, tests, determination, wettability, mercerizing, shrinkage, cotton spun yarns, test equipment. !i Price based on 5 pages . Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
4、ee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The wor
5、k of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been authorized has the right to be represented on that committee. International organizations, governmental and non-governmental, in
6、 liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 6836 was developed by Technical Committe
7、e ISO/TC 91, Surface active agents, and was circulated to the member bodies in March 1982. It has been approved by the member bodies of the following countries : Austria Iran Egypt, Arab Rep. of Italy France Japan Germany, F. R. Mexico Hungary Netherlands Poland Romania Spain Switzerland USSR The me
8、mber body of the following country expressed disapproval of the document on technical grounds : Belgium 0 International Organization for Standardization, 1993 0 . Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Tech
9、nical Standards 1/9972545001 Not for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 6836-1983 (E) Surface active agents - Mercerizing agents - Evaluation of the activity of wetting products for mercerization by determi
10、nation of the shrinkage rate of cotton 0 Introduction The effectiveness of strongly alkaline mercerizing liquor used for mercerization (or causticization) depends, amongst other things, on the rapidity with which the sodium hydroxide solution impregnates the material and penetrates into the cellulos
11、e fibre the swelling of which causes shrinkage in the longitudinal direction of the fibre under tension which is transmitted to the material and allows the mercerization effect as such to be achieved. In order to shorten the time required for penetration by the sodium hydroxide solution, special wet
12、ting agents are added to the mercerizing or causticizing liquor. 1 Scope and field of application This International Standard specifies a method for evaluating the activity of wetting products for mercerization by determi- nation of the shrinkage rate of cotton threads. The method is only applicable
13、 to mercerizing or causticizing baths. 2 Reference IS0 607, Surface active agents and detergents - Methods of sample division. 3 Definitions For the purpose of this International Standard, the following definitions apply. 3.1 mercerizing agent : A product used to improve the wetting power of merceri
14、zing liquor and thus to speed up its uniform penetration into the fibres. 3.2 shrinkage rate : Modification of the length of the cotton yarn, expressed in millimetres per second under the influence of the mercerizing liquor. 4 Principle Immersion in the liquor containing the agent being studied of a
15、 hank of smooth cotton held by a hook and with a weight fixed on the end of it. Determination of the shrinkage of the hank at different intervals of time using one of the two pieces of apparatus described. 5 Reagents During the test, use only reagents of recognized analytical grade and only distille
16、d water or water of equivalent purity. 6.1 Sodium hydroxide solution, Q, I,24 g/ml. Dissolve 270 g of sodium hydroxide in 1 litre of water. NOTE - For each agent to be examined I,5 litres of sodium hydroxide solution are required. 6 Apparatus and material 6.1 Cotton yarn, the type and designation of
17、 which are exactly defined in the test report. For comparative tests, see the note. NOTE - As the shrinking ability depends upon the type of raw cotton, the fineness of the yarn (tex number), its twist and also, possibly, on the type of twist, comparative tests should only be carried out on one and
18、the same yarn. Tests with different yarns of the same type but from different consi,gnments or from different sources may give divergent values. 6.1.1 Preparation of the hanks of yarn Using a winder with a perimeter of 1 m under the lowest possible tension, make the number of revolutions necessary t
19、o obtain a test hank of mass 1 f 0,2 g. Then remove this hank from the winder, still without tension, and fold it in two so that it is approximately 24 cm in length. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/
20、9972545001 Not for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6836-1983 (El 6.1.2 Conditioning of the hanks of the yarn Store the hanks prepared according to 6.1.1 for at least 24 h before testing in a standard atmosphere at a temperatur
21、e of 20 k 2 “C and a relative humidity of 65 % f 2 %. 6.2 Apparatus for measuring shrinkage. 6.2.1 Hintzmann apparatus The apparatus (see figure 1) consists of a plastics support 0, fitted with a device 2 for holding a glass cylinder 6 closed 0 0 on one side and intended to contain the mercerizing l
22、iquor. Adjustable screws at the base of the support keep it cor- rectly in the vertical position. The glass cylinder 0 6 is bunged at the top by a removable fitted plastics lid . To this lid is fitted a hook which holds the hank of yarn weighted with a weight of mass 10 k 0,l g. To the support 0 is
23、fixed a ring to hold the lid and also a millimetre scale 0 4 to measure the length of the hank before and during the test. The material of which the apparatus is made shall be alkali resis- tant. 6.2.2 Servo apparatus The apparatus (see figure 2) consists of a support com- prising a vertically movab
24、le stem the height of which can be adjusted with the screw 0, an arm with two right-angle bends integral with the stem to which is fixed a hook and a guiding pulley 8, and a disc 0 7 graduated in percen- tage of shrinking with a moving needle which can be re- set to zero. At the top of the arm a gui
25、de is attached through which passes a small metal plate which moves with virtually no resistance and is fitted with a hook. At the foot of the support there is a small tray containing filter paper to absorb drops of mercerizing liquor if necessary. The hank is placed under tension by means of a coun
26、terweight of mass approximately 50 g. NOTE - The choice of the mass of the weight 0 11 depends on the nature of the yarn and its value should be stated in d) of the test report (clause IO). 6.3 Stop-watch. 7 Sampling The laboratory sample of mercerizing agent shall be prepared and stored in accordan
27、ce with the requirements of IS0 607. 8 Procedure 8.1 Test portion Weigh, to the nearest 0,Ol g, the quantity of the laboratory sample required to obtain a concentration of 3 g/l after dissolu- tion in the sodium hydroxide solution (5.1). Carry out the dissolution immediately before the test. 8.2 Det
28、ermination 8.2.1 General For each test, carry out a series of five measurements. These tests shall be carried out first with a solution prepared no more than 15 min in advance and the other tests shall then follow very quickly one after the other. The temperature of the solution shall be 20 + 2 OC.
29、It is thus advisable to bring the solution under examination to a tem- perature of 18 OC before putting it into the glass cylinder so that it is at the temperature required during the tests. 8.2.2 Determination of the rate of shrinkage (Servo apparatus) Bring the vertical stem to its maximum height,
30、 fix the hank (6.1 .I) to the hooks and and set the needle to zero. Place the glass cylinder, filled with the mercerizing liquor under examination, on the tray 12 , lower the vertical stem 0 0 2 until the hank is totally immersed and fix in position by means of the adjustable screw 0. Start the stop
31、-watch (6.3) immediately and record the time at which shrinkage reaches a value of 3 %, 6 %, 9 %, 12 %,. 8.2.3 Determination of the time corresponding to 60 % of the total shrinkage and of the shrinkage as a percentage of the total shrinkage (Hintzmann apparatus) Place the glass cylinder in the supp
32、orting device and fill it to just over the zero mark with the mercerizing liquor under examination. Hook the hank (6.1 .I) onto the hook , and attach the weight to the lower part of the hank. Put the whole of this assembly into the support so that the lid is firmly fixed in the support. Read the ini
33、tial length of the hank on the millimetre scale level with the lower edge of the weight. Then remove the lid with the hank and the v do this within 1 s. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 No
34、t for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6636-1963 (El Start the stop-watch (6.3) as soon as immersion has taken place. Note the shrinkage of the hank at intervals of 10 s up to 90 s, by reading the lengths on the millimetre scal
35、e level with the lower edge of the weight. Finally, note the shrinkage value after 300 s (5 min). When interpreting the results, consider this value as the total shrinkage. 9 Expression of results 9. l Rate of shrinkage The rate of shrinkage for the mercerizing agent under examina- tion, expressed i
36、n millimetres per unit of time, is calculated by the tangent of the linear part of the curve obtained by plotting the values of the arithmetic mean of the percentage of shrinkage of the five series of tests as ordinates and the cor- responding values of the time as abscissae. 9.2 Time corresponding
37、to 50 % of the total shrinkage From the arithmetic mean value of the values obtained during the five series of tests, the percentage of shrinkage at a given time in relation to the total shrinkage is given by the formula 0 - t -x loo lo - L where I, is the length, in millimetres, of the hank with th
38、e weight attached, before the test; I, is the length, in millimetres, of the hank with the weight at a given time t; Lo is the length, in millimetres, of the hank with the weight after 5 min. The time corresponding to 50 % of the total shrinkage is deter- mined by means of a logarithmic scale by plo
39、tting a graph, having the values of the percentage of shrinkage as ordinates and the corresponding values of the time as abscissae. The perpendicular dropped on the axis of abscissae from the point of intersection of the straight line with the ordinate cor- responding to 50 % of the total shrinkage
40、shows the time in seconds required to reach 50 % of the total shrinkage. 9.3 Percentage of shrinkage at a given time The percentage of shrinkage after a given time is given by the formula 10 - 4 -x loo I, - h where I, is the length, in millimetres, of the hank with the weight attached, before the te
41、st; I, is the length, in millimetres, of the hank with the weight at a given time t; h is the height, in millimetres, of the weight with the hook. 10 Test report The test report shall contain the following information : a) all the information necessary for the complete iden- tification of the sample
42、; b) the type and designation of the cotton yarn used; c) the concentration of the solution; d) the apparatus used; e) the reference of the method used (reference to this International Standard); f) the results obtained and the method of expression used : I) percentage of shrinkage at a given time i
43、n relation to the total shrinkage, 2) percentage of shrinkage at a given time, 3) time corresponding to 50 % of the total shrinkage, 4) rate of shrinkage; g) any operational details not provided for in this Interna- tional Standard or in the International Standard to which reference is made or regar
44、ded as optional, as well as any in- cidents which may have influenced the results. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permi
45、tted without license from IHS -,-,- ISO6836-1983(E) Dimensions in millimetres 62 c 7 & 65 32 I , . Ln c: 1 F t c ,+29 I I a- v a F o- 6 I I I m 125 c Front view Side view 0 6 Glass cylinder 0 7 Removable lid 0 8 Hook Weight 0 10 Hank of yarn Plastics support Supporting device Supporting device Milli
46、metre scale Adjustable screw Figure 1 - Hintzmann apparatus 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permitted without license
47、from IHS -,-,- IS0 6836-1983 (E) ClJ Support 0 2 Stem Adjustable screw 0 4 Arm 0 5 Hook Guiding pulley Disc 0 8 Moving needle 0 9 Metal plate with hook Guide Weight 0 12 Small tray Figure 2 - Servo apparatus Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 10:00:02 MDTNo reproduction or networking permitted without license from IHS -,-,-