GB/T 20623-2006 English PDF (GBT20623-2006)

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GB/T 20623-2006: Emulsions for architectural coatings
GB/T 20623-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.060.20
G 52
Emulsions for architectural coatings
ISSUED ON: SEPTEMBER 01, 2006
IMPLEMENTED ON: FEBRUARY 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Requirements ... 5
4 Test method ... 5
5 Inspection rules ... 8
6 Marking, packaging, storage ... 8
Appendix A (Normative) Determination of the total amount of residual monomers .. 10
References ... 16
Emulsions for architectural coatings
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking,
packaging, storage of various synthetic resin emulsions with water as the dispersion
medium, which are prepared by emulsion polymerization of monomers such as acrylate,
methacrylate, vinyl ester of acetic acid or other organic acids, styrene.
This standard applies to general synthetic resin emulsions, that play a film-forming and
bonding role in building interior and exterior wall coatings.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 1250 Rules for expression and judgement of limiting values
GB/T 2794-1995 Determination methods for viscosity of adhesives
GB 3186 Sampling paint products
GB/T 9267-1988 Determination of minimum film-forming temperature of emulsion
for latex paints (neq ISO 2115:1976)
GB/T 9750 Marks for package of coating products
GB/T 13491-1992 General rule for packing of coatings
GB 18582-2001 Indoor decorating and refurbishing materials - Limit of harmful
substances of interior architectural coatings
HG/T 2458-1993 General rules for the inspection, transportation and storage of paint
products
4.7 Freeze-thaw stability
Put 50 g of the specimen into a cylindrical plastic or glass container of about 100 mL;
be careful not to mix in bubbles; cover it with a lid to seal. Put it in a (-5 ± 2) °C low
temperature box; take it out after 18 h; place it at (23 ± 2) °C for 6 h. After repeating
this three times, open the container; stir it with a glass rod; observe whether the sample
has any abnormal phenomena such as lumps and condensation. If not, it is considered
"no abnormality". The sample can be spread on the glass plate into a uniform thin layer
with the help of a glass rod; then the presence of floccules can be observed.
4.8 Storage stability
Put about 0.5 L of the sample into a suitable plastic or glass container, leaving about
10% of the space in the bottle; seal it and place it in a (50 ± 2) °C constant temperature
drying oven. After 2 weeks, take it out and place it at (23 ± 2) °C for 3 hours. Open the
container and observe whether there is stratification, crusting, lumps, flocculation. The
specimen can be spread on the glass plate into a uniform thin layer with the help of a
glass rod; then the presence of floccules can be observed.
4.9 Dilution stability
The specimen is diluted with distilled water to a non-volatile content of (3 ± 0.5)%;
then the aqueous dispersion is placed in a 100 mL stoppered measuring cylinder. After
standing for 72 hours, the volume of the upper clear liquid and the volume of the bottom
precipitate are measured. The dilution stability is expressed as the volume fraction of
the upper clear liquid and the bottom precipitate in 100 mL of the diluent; the result is
rounded to an integer.
4.10 Mechanical stability
Put (400 ± 0.5) g of filtered emulsion [filter with pore size of 177 μm (80 mesh)] into a
suitable container of about 1000 mL (diameter of about 100 mm, height of about 180
mm); place it on the high-speed disperser base; fix it with a clamp; start the disperser
(mixing head is disc-shaped, diameter of about 40 mm); adjust the speed to 2500 r/min;
disperse for 0.5 h; filter again; use tap water to flush the residue on the inner wall of the
container into the filter; rinse the filter with tap water; observe whether the emulsion is
demulsified and whether there are obvious flocculants.
4.11 Calcium ion stability
Add 30 mL of emulsion to a small beaker; then add 6 mL of 0.5% CaCl2 solution; stir
well and place in a 50 mL stoppered measuring cylinder. After 48 hours, observe
whether there is stratification, precipitation, flocculation, etc. The specimen can be
spread on a glass plate into a uniform thin layer, with the help of a glass rod; then
observe whether there is flocculation.
4.12 Total residual monomers
It is carried out according to Appendix A.
4.13 Free formaldehyde
It is carried out according to the provisions of Appendix B of GB 18582-2001.
4.14 Volatile organic compounds (VOC)
It is carried out according to the provisions of Appendix A of GB 18582-2001.
5 Inspection rules
5.1 Inspection classification
5.1.1 Product inspection is divided into exit-factory inspection and type inspection.
5.1.2 Exit-factory inspection items include container status, non-volatile matter, pH
value, viscosity.
5.1.3 Type inspection items include all technical requirements listed in this standard.
5.1.3.1 Under normal production conditions, 5 items — freeze-thaw stability, storage
stability, dilution stability, mechanical stability, calcium ion stability — are tested once
a quarter; the total residual monomer is tested once every six months; 3 items — the
minimum film-forming temperature, free formaldehyde, volatile organic compounds —
are tested once a year.
5.1.3.2 Type inspection shall also be carried out in other cases specified in 3.2 of HG/T
2458-1993.
5.2 Determination of inspection results
It is carried out according to the rounded value comparison method in GB/T 1250.
6 Marking, packaging, storage
6.1 Marking
It is carried out according to the provisions of GB/T 9750.
6.2 Packaging
It is carried out according to the provisions of the secondary packaging requirements in
GB/T 13491-1992.
6.3 Storage
Appendix A
(Normative)
Determination of the total amount of residual monomers
A.1 Principle
After the sample is diluted, the prepared sample is injected into the chromatographic
column using the headspace injection technique. The vinyl acetate, acrylonitrile, ethyl
acrylate, methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate monomers to be
tested are separated from other components by vaporization; it is detected by a
hydrogen flame ionization detector and quantified by the internal standard method.
A.2 Scope of application
This method is applicable to the determination of the content of unreacted residual
monomers (such as vinyl acetate, acrylonitrile, ethyl acrylate, methyl methacrylate,
styrene, butyl acrylate, isooctyl acrylate) in various synthetic resin emulsions. The
measurement range is 0.001% ~ 1.0%. Emulsion samples with residual monomer
content not in this range can be determined by this method after appropriate dilution
and adjustment.
A.3 Reagents and materials
A.3.1 Unless otherwise specified, the reagents...