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Determination of volatile organic compound (VOC) content in reactive diluent containing coatings
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GB/T 34682-2017: PDF in English (GBT 34682-2017) GB/T 34682-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Determination of volatile organic compound (VOC)
content in reactive diluent containing coatings
ISSUED ON: NOVEMBER 01, 2017
IMPLEMENTED ON: MAY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Principle ... 5
5 Instruments and equipment... 5
6 Sample ... 7
7 Test steps ... 7
8 Test data processing ... 8
Determination of volatile organic compound (VOC)
content in reactive diluent containing coatings
1 Scope
This Standard specifies terms and definitions, principle, instruments and
equipment, sample, test steps as well as test data processing for determination
of volatile organic compound (VOC) content in reactive diluent containing
coatings.
This Standard is applicable to the determination of volatile organic compound
(VOC) content in reactive diluent containing coatings. It is inapplicable to
determination of volatile organic compound (VOC) content in radiation curing
coating.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 3186, Paints varnishes and raw materials for paints and varnishes -
Sampling
GB/T 5206-2015, Paints and varnishes - Terms and definitions
GB/T 6750, Paints and varnishes - Determination of density - Pycnometer
method
GB/T 6753.4-1998, Paints and varnishes - Determination of flow time by use
of flow cups
GB/T 9278, Temperatures and humidity for conditioning and testing of paint
specimens
GB 18582-2008, Indoor decorating and refurbishing materials - Limit of
harmful substances of interior architectural coatings
GB/T 20777, Paints and varnishes - Examination and preparation of samples
for testing
The diameter is (75±5)mm, and the edge height is 5mm or it can ensure that
the sample does not overflow. The plates of different diameters can also be
used. At this time, formula (1) is used to calculate the mass of the sample used
for the test, m, in grams (g):
Where,
mstandard - Numerical value of the mass of the test standard sample, in grams
(g);
d - Numerical value of the diameter of the bottom of the plate, in millimeters
(mm);
75 - Numerical value of the standard diameter of the plate, in millimeters (mm).
NOTE: For viscous coating, it can also use approximately 0.1mm thick aluminum foil to cut
into a rectangle with a size of (100±10)mm × (300±10)mm that can be folded in half. Spread
the viscous liquid completely by gently squeezing the two parts folded in half.
5.2 Syringe
Disposable syringe with a capacity of 10mL.
5.3 Oven
WARNING - In order to prevent explosion or fire, samples containing
volatile substances shall be handled carefully and implemented in
accordance with relevant national regulations.
To ensure the safety of the test, a forced convection oven shall be used, which
can be kept within ±2°C of the specified or agreed temperature and equipped
with horizontally placed partitions. It can also use a natural convection oven that
a metal partition with holes is installed at 1/3 of the height of the studio.
5.4 Dryer
Packed with a suitable desiccant, such as dry silica gel impregnated with cobalt
chloride.
5.5 Balance
Accuracy is 1mg.
m = mstandard
6 Sample
Conduct sampling according to GB/T 3186 or the agreed method. Sampling
amount is determined according to inspection needs.
Check and prepare samples according to GB/T 20777.
7 Test steps
7.1 Non-volatile content
7.1.1 Conduct two tests in parallel.
7.1.2 Degrease and clean the metal flat-bottom plate (see 5.1). In order to
improve the precision, it is recommended to put the plate (see 5.1) in the oven
(see 5.3) at (105±2)°C for 30min. Then place in the dryer (see 5.4) until use.
7.1.3 Prepare the sample according to the specified ratio and dilution ratio of
the product. Mix well. If the amount of diluent used is within a certain range, it
shall be determined after mixing according to the maximum dilution ratio
specified in the recommended product construction ratio.
7.1.4 Weigh the mass of the metal flat-bottomed plate (see 5.1) m0, to the
nearest of 1mg. Weigh (3±0.1)g of the sample to be tested (see 7.1.3) into the
plate (see 5.1), to the nearest of 1mg. Record the mass m1 (at this time, m1 is
the sum of m0 and the mass of the sample). For high-viscosity samples
(according to GB/T6753.4-1998, use No. 6 outflow cup to measure the outflow
time t≥74s) or easy-crusting samples, use a weighed wire (such as an
unpainted curved paperclip) to flatten the sample (at this time, m0 is the sum of
the mass of the wire and the plate). If necessary, add (3±1)mL of volatile
suitable solvent (such as acetone, ethanol) that can dilute the sample. After
mixing, spread the sample on the bottom of the plate.
NOTE 1: For volatile samples, it is recommended to put the fully mixed sample into a bottle
with stopper or into a weighable pipette or a 10mL syringe without needle (see 5.2). Use
reduction method to weigh (3±0.1)g of the sample to be tested (to the nearest of 1mg) into
the plate (see 5.1) (at this time, m1 is the sum of the mass of the sample and m0). Spread
flat on the plate bottom.
NOTE 2: If the sample to be tested is not completely spread at the plate bottom (see 5.1),
incomplete curing due to local paint film being too thick may make the results of the non-
volatile content test larger.
7.1.5 After weighing, place the metal flat-bottomed plate with the sample under
the conditions of [temperature is (23±2)°C and relative humidity is (50±5)%]
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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