GB/T 12009.3-2009Plastics -- Polyethylene polyphenol isocyanate -- Part 3: Determination of viscosity (English PDF)

Foreword

GB/T 12009 "plastic polymethylene polyphenyl isocyanate" is divided into five sections.

--- Part 1. Determination of total chlorine content;

--- Part 2. Determination of hydrolyzable chlorine content;

--- Part 3. Determination of viscosity;

--- Part 4. Determination of isocyanato content;

--- Part 5. Determination of acidity.

This section GB/T Section 312,009, modifications adopted ISO 3219:1993 "plastic liquid state or as emulsions or dispersions of poly Polymer/resin was measured at a rotational viscometer with defined shear rate viscosity "(in English).

This section according to ISO 3219:1993 redrafted in order to facilitate comparison, are listed in this section with informative Appendix B ISO 3219:1993 technical differences, and in the text with a single vertical line identification.

For ease of use, this section made the following editorial changes.

a) to the "international standards" be replaced by "this section";

b) Remove the ISO 3219:1993 Foreword;

c) increase the national standard foreword;

d) For the ISO 3219:1993 international standard other references have been adopted as the equivalent of a standard, this part of the country with references National standards instead of the corresponding international standards;

e) use of decimal notation. "" instead of the international standard decimal symbol "." this Part replaces GB/T 12009.3-1989 "polymethylene polyphenyl isocyanate viscosity measurement method." this section compared with the GB/T 12009.3-1989 The main changes are as follows.

--- Shear rate gives two series;

--- Precision instrument made provisions;

--- Measured for 3 times;

--- Added two appendices;

--- Increasing the viscosity meter calibration;

--- Circulating bath temperature (0 ~ 50) °C range can be constant at ± 0.2 °C;

--- Increase the accuracy of the thermometer should be 0.05 °C.

Appendix A to this part of the normative appendix, Appendix B is an informative annex.

This part is proposed by the China Petroleum and Chemical Industry Association.

This part of the National Standardization Technical Committee of plastic products and plastic resins General Methods Chapter (SAC/TC15/SC4) centralized.

This section is responsible for drafting. National Quality Supervision and Inspection Center of synthetic resin.

This section participated in the drafting unit. China National Bluestar (Group) Co., Ltd., Lansing (Tianjin) Chemical Co., Ltd., Cangzhou Dahua Group Company Secretary of Jiangsu Province Chemical Research Institute Co., Ltd., Yantai Wanhua Polyurethane Co., Ltd.

1 Scope

This section GB/T 12009 gives the coaxial having a predetermined shear rate double cylindrical rotary viscometer viscosity method.

This section applies to multi-polymethylene polyphenyl isocyanate ester viscosity measurement.

Principle 2

With used with the specified characteristics of the viscometer according to the shear rate and shear stress measurements obtained viscosity liquid sample.

(1) viscosity eta is defined by the formula.

eta =

gamma

Where.

--- viscosity [eta], in units of Pascal seconds (Pa · s);

[tau] --- shear force unit Pascals (Pa);

gamma --- shear rate in second (s-1).

According to the International System of Units (SI) unit of viscosity is Pascal seconds (Pa · s) 1Pa · s = 1N · s/m2

Note 1. Sign and GB 3102.3 "Quantities and units of mechanics' agreement.

Kwan called Newtonian liquids.

3 Instrument