GB/T 12009.5-2016 Active National standards

GB/T 12009.5-2016 Plastics—Aromatic isocyanates for use in the production of polyurethane—Part 5:Determination of acidity

Publish Date: 2016-02-24 Implement Date: 2016-09-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 12009.5-2016

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods for synthetic resins and plastics

ICS Name: Raw materials for rubber and plastics

Publish Date: 2016-02-24

Implement Date: 2016-09-01

Pages: 8 pages

Scope

This part of GB/T 12009 specifies the method for determining the acidity of aromatic isocyanates used in polyurethane production by potentiometric titration. This part is applicable to the determination of acidity in aromatic isocyanates and their prepolymers used as raw materials for polyurethane. Method A is suitable for crude or modified diphenylmethane diisocyanate, polyisocyanates with multiple methyl groups, and toluene diisocyanate products with medium/high acidity values (> 100 μg/g). Method B is suitable for refined, crude, or modified diphenylmethane diisocyanate, polyisocyanates with multiple methyl groups, and toluene diisocyanate products with low acidity values (< 100 μg/g). These methods are also applicable to mixtures of toluene diisocyanate, diphenylmethane diisocyanate, and polyisocyanates with multiple methyl groups. Other isocyanates, if proven suitable, can also be tested using this method.