ISO 14848:1998 プラスチック—不飽和ポリエステル樹脂—130℃での反応性の測定 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO 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 and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard ISO 14848 was prepared by Technical Committee ISO/TC 61,Plastics, Subcommittee SC 12, Thermosetting materials.

Introduction

The processing of unsaturated-polyester resins, as well as formulated products such as bulk moulding compound (BMC) and sheet moulding compound (SMC), depends on their reactivity, i.e. on their ability to polymerize under the action of a catalyst and under the effect of heat.

The reactivity of such resins may be determined by different methods, such as this International Standard which makes use of the variation in temperature as a function of time.

The use of the standardized conditions given in this International Standard make it possible to carry out comparisons between similar types of unsaturated-polyester resin.

1 Scope

This International Standard specifies a method of measuring

• the time required for the temperature of a solution of unsaturated-polyester resin and a catalyst, heated in a thermostatically controlled bath at 130 °C, to rise
• • from 80 °C to 140 °C,
• • from 80 °C to the maximum temperature reached;
• the maximum temperature reached;
• the speed of the reaction, determined by drawing a tangent at the point of inflection of the temperature/time curve.

It applies in particular to unsaturated-polyester resins processed at a temperature higher than 100 °C.

• a) The quantity and form of the resin sample being examined (test tube diameter, height of resin in the tube).
• b) The rate at which the sample is heated in the bath. For example, the use of a liquid having a relatively low heat capacity (ethylene glycol, silicone oil) leads to slower heating.
• c) The type of thermometer used. Thermometers having a response slower than that of a thermocouple, and resistance probes having too large a heat-sensitive element, are unsuitable.
• d) The position of the heat-sensitive element in the resin, both heightwise and relative to the axis of the test tube containing the resin.
• e) The nature of the catalyst.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.