This International Standard specifies a microtitration method to measure the degree of unsaturation in polyether polyols used in the production of polyurethanes. It is based on the reaction of mercuric acetate with double bonds in the polyol. It does not apply to compounds in which the unsaturation is conjugated with carbonyl, carboxyl or nitrile groups. The product being measured must be essentially dry and free of inorganic salts, especially halides.<\/p>\n
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| 3<\/td>\n | TitlePage – Plastics\ufffd\u2014 Polyols for use in the production of polyurethane\ufffd\u2014 Determination of degre… <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | TableofContent – Contents Page <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Foreword – Foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Introduction – Introduction <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Scope – 1\ufffd\ufffd\ufffd Scope NormativeReference – 2\ufffd\ufffd\ufffd Normative references <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Clause1 – 4\ufffd\ufffd\ufffd Principle Clause1 – 5\ufffd\ufffd\ufffd Application Clause1 – 6\ufffd\ufffd\ufffd Interferences Clause1 – 7\ufffd\ufffd\ufffd Reagents UntitledSubclause2 – 7.1\ufffd\ufffd\ufffd Methanolic mercuric acetate solution UntitledSubclause2 – 7.2\ufffd\ufffd\ufffd Methanolic potassium hydroxide solution UntitledSubclause2 – 7.3\ufffd\ufffd\ufffd Methanolic hydrochloric acid solution <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | UntitledSubclause2 – 7.4\ufffd\ufffd\ufffd Sodium bromide UntitledSubclause2 – 7.5\ufffd\ufffd\ufffd Methanol Clause1 – 8\ufffd\ufffd\ufffd Apparatus UntitledSubclause2 – 8.1\ufffd\ufffd\ufffd Autotitrator UntitledSubclause2 – 8.2\ufffd\ufffd\ufffd Analytical balance UntitledSubclause2 – 8.3\ufffd\ufffd\ufffd Pipette UntitledSubclause2 – 8.4\ufffd\ufffd\ufffd Titration vessel Clause1 – 9\ufffd\ufffd\ufffd Sampling Clause1 – 10\ufffd\ufffd\ufffd Procedure UntitledSubclause2 – 10.1\ufffd\ufffd\ufffd This method requires at least a two-fold molar excess of mercury rea… UntitledSubclause2 – 10.2\ufffd\ufffd\ufffd Add UntitledSubclause2 – 10.3\ufffd\ufffd\ufffd Titrate using UntitledSubclause2 – 10.4\ufffd\ufffd\ufffd Titrate a blank using the same procedure, but without adding a test … UntitledSubclause2 – 10.5\ufffd\ufffd\ufffd To determine the acidity or basicity of the polyol in order to corre… <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Clause1 – 11\ufffd\ufffd\ufffd Expression of results UntitledSubclause2 – 11.1\ufffd\ufffd\ufffd Calculate the acidity of the sample as follows: UntitledSubclause2 – 11.2\ufffd\ufffd\ufffd Calculate the basicity of the sample as follows: UntitledSubclause2 – 11.3\ufffd\ufffd\ufffd Calculate the degree of unsaturation of the sample, in Clause1 – 12\ufffd\ufffd\ufffd Precision and bias Subclause2 – 12.1\ufffd\ufffd\ufffd Precision <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Subclause2 – 12.2\ufffd\ufffd\ufffd Bias Clause1 – 13\ufffd\ufffd\ufffd Test report <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Bibliography – Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Plastics. Polyols for use in the production of polyurethane. Determination of degree of unsaturation by microtitration<\/b><\/p>\n |