GB/T 1670-2008Plasticizers - Test method of heat resistance (English PDF)

Foreword

This standard also replace the GB/T 1670-1988 "Plasticizers thermal stability test" and GB/T 6489.1-2001 "industrial phthaloyl After testing methods formic acid esters heat treatment color measurements. " This standard and GB/T 1670-1988 technical differences are as follows:

--- Range added "This standard does not apply to diallyl phthalate, because it has the danger of explosive polymerization." This standard and GB/T 6489.1-2001 technical differences are as follows:

--- Procedure Determination of acid added to the sample after the heat treatment. Appendix A of this standard is an informative annex. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee rubber chemical additives and rubber Technical Committee. This standard is drafted by: Shanxi Institute of Chemical Engineering. The main drafters of this standard. Guo Yanping. This standard replaces the standards previously issued as follows:

--- GB/T 1670-1981, GB/T 1670-1988.

--- GB/T 6489.1-1986, GB/T 6489.1-2001. Plasticizers thermal stability test Warning. Use of this standard should be familiar with normal laboratory practice. This standard does not purport relates to the use of this standard may occur All security issues. Establish appropriate safety and health practices and determine the adaptive management system is the responsibility of the user.

1 Scope

GB/T 1670-2008 is the Chinese national standard on plasticizers - test method of heat resistance, in the field of rubber and plastic industries. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 18 June 2008 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 February 2009. Classification: ICS 83.040.30, CCS G70. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This standard specifies the phthalates, adipates, thermal stability test methods for class sebacate plasticizers. This standard applies to phthalate esters, adipic acid esters, sebacic acid esters Determination of thermal stability plasticizers. This standard does not apply to diallyl phthalate, because it has the danger of explosive polymerization.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. Determination of

GB/T 1664 plasticizer appearance chroma Determination of

GB/T 1668 plasticizer and an acid value of acidity

3 Terms and Definitions

The following terms and definitions apply to this standard.

3.1 After the plasticizer is heated at a temperature which changes the appearance of color and an acid is called the thermal stability of the plasticizer.

4 Instrument

4.1 Heat tubes. borosilicate glass, a length of about 200mm, an outer diameter of 38mm ± 1mm, a wall thickness of 1.5mm ± 0.2mm, and with There are ground glass stopper.

4.2 thermostatic oil bath. temperature can be controlled at 180 °C ± 2 °C, when the test tube containing the sample is inserted into the oil bath temperature is kept constant. (oil bath See Appendix A). Step

5 Analysis Take two heat tubes were put into 70mL or 120mL sample, the lightly covered with ground glass stopper, placed in an oil bath. Oil bath surface It should be higher than the sample level, temperature controlled oil bath at 180 °C ± 2 °C, and to ensure uniform temperature within the oil bath, after 2h after the sample was taken out from the oil bath Tube and air cooled to room temperature (about 1.5h). Determination of acid value and chroma samples. Color according to the provisions GB/T 1664 were measured. Acid number GB/T 1668 provisions were measured.