GB/T 9757-2001 PDF English
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Solvent-thinned coatings for exterior wall
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Solvent-thinned coatings for exterior wall
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GB/T 9757-2001: PDF in English (GBT 9757-2001) GB/T 9757-2001
ICS 87.040
G 51
GB
National Standard
of the People’s Republic of China
Solvent-thinned coatings for exterior wall
ISSUED ON. JUNE 09, 2001
IMPLEMENTED ON. APRIL 01, 2002
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Product Classification ... 6
4 Requirements... 6
5 Test methods ... 8
6 Inspection rules ... 12
7 Marking, packing and storage ... 12
Appendix A ... 14
Foreword
This Standard is the revision to recommended national standard GB/T 9757-
1988 Solvent-thinned coatings for exterior wall.
The main technical differences between this Standard and the former vision are.
— In this Standard, it divides the products into 3 grades – “superior
product”, “first grade product”, and “qualified product”; in GB/T 9757-
1988, there is no grading.
— In this Standard, it deletes the item “solid content”;
— In this Standard, it deletes the item “fineness”;
— In this Standard, it uses “contrast ratio” to replace the item “hiding rate”;
— In this Standard, the indicators “water resistance”, “alkali resistance”
and “artificial climate ageing resistance” have been increased to some
extent;
— In this Standard, the cycling number of “coating’s temperature
resistance” is changed from 10 times to 5 times.
Appendix A of this Standard is a standard Appendix.
This Standard shall replace GB/T 9757-1988 from the implementation date.
This Standard was proposed by State Bureau of Petroleum and Chemical
Industry.
This Standard shall be centralized by National Paints and Pigments
Standardization Technical Committee.
Main drafting organization of this Standard. Shanghai Watson Chemical Plant,
Nanjing Huacai Special Paint Factory, and Changzhou Coating Chemical
Research Institute of China National Chemical Construction Corporation.
Main drafters of this Standard. Wang Jianzhong, Li Hongjin, Liu Jiyuan,
Zhaoling, and Feng Shifang.
This Standard was issued first-time in 1988.
This Standard shall be explained by National Paints and Pigments
Standardization Technical Committee.
National Standard of the People’s Republic of China
Solvent-thinned coatings for exterior wall
Replacing GB/T 9757-1988
1 Scope
This Standard specifies product classification, requirements, test methods,
inspection rules, marking, packaging, and storage of solvent-thinned coatings
for exterior wall.
This Standard applies to solvent-thinned coatings for exterior wall of which the
basic material is synthetic resin; which is made of pigments, body pigments and
other auxiliaries; and after being smeared, which can form a thin coating with
flat surface. This coating applies to decoration and protection of external
surface of buildings and structures.
2 Normative references
The articles contained in the following documents have become part of this
Standard when they are quoted herein. For the dated documents so quoted, all
the modifications or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest editions shall be
applicable to this Standard.
GB/T 1250-1989 Rules for expression and judgment of limiting values
GB/T 1727-1992 Methods of producing films of paints, varnishes, lacquers and
related products on test plates
GB/T 1728-1979 (1989) Methods of test for drying time of coatings of paints
and putties
GB/T 1733-1993 Determination of resistance to water of films
GB/T 1766-1995 Paint and varnish - Rating schemes of degradation of coats
GB/T 1865-1997 Paints and varnishes-Artificial weathering and exposure to
artificial radiation-Filtered xenon-arc radiation (eqv ISO 11341.1994)
GB 3186-1982 (1989) Sampling paint products (neq ISO 1512.1974)
GB/T 6682-1992 Water for laboratory use; Specifications (neq ISO 3696.1987)
GB/T 9265-1988 Determination for alkali resistance of film of architectural
paints and coatings
GB/T 9266-1988 Determination of scrub resistance of film of architectural paints
and coatings
GB/T 9270-1988 Determination of contrast ratio of light colored paints (using
polyester film) (eqv ISO 3906.1980)
GB/T 9271-1988 Paints and varnishes - Standard plates for testing (eqv ISO
1514.1984)
GB 9278-1988 Temperatures and humidities for conditioning and testing of
paint specimens (eqv ISO 3270.1984)
GB/T 9750-1998 Marks for package of coating products
GB/T 13491-1992 General rule for packing of coatings
GB/T 15608-1995 The Chinese color system
HG/T 2458-1993 General Rules for the Inspection, Transportation and Storage
of Paint Products
JC/T 412-1991 Asbestos cement flat sheets for architecture
JG/T 25-1999 Determination for freeze-thaw resistance of film of building
coatings
3 Product Classification
The products are divided into 3 grades. superior product, first grade product,
and qualified product.
4 Requirements
Products shall meet the technical requirements of Table 1.
It shall be done according to GB/T 9750. If it needs dilution, diluent and dilution
rate shall be indicated.
7.2 Packaging
It shall be done according to the grade 1 packaging requirements in GB/T 13491.
7.3 Storage
Product storage shall ensure ventilation, desiccation. It shall prevent from direct
sunlight and it shall isolate the source of fire and be away from heat. According
to the type of resin, product shall formulate the storage life and indicate it on
the packaging logos.
Appendix A
(Standard appendix)
The test method of coating stain resistance
A.1 Principle
This method uses fly ash as contaminated media, and mixes it together with
water to brush on the coating plate. WASH it with water after drying. After a
specified cycle, DETERMINE the decreasing rate of reflection coefficient of
coating, so as to express the coating stain resistance.
A.2 Main material, instruments and device
A.2.1 Fly ash1)
A.2.2 Reflectance instrument
Comply with the provision 4.3 of GB/T 9270-1988.
A.2.3 Balance
Sensitivity of 0.1g.
A.2.4 Soft brush
Width of (25~50) mm.
A.2.5 Flushing device
As shown in figure 1. Water tank, water pipes and sample frames are made of
rust-resistant and hard material.
A.3 Test
A.3.1 Preparation of fly-ash water
Weigh appropriate fly ash in the mixing container, and mixed it with water evenly
according to the proportion of 1.1 (mass).
A.3.2 Operation
DETERMINE the original reflection coefficient of the after-care coating test
plates at 3 positions at least, TAKE its average value, and DENOTE as A. USE
soft brush to brush (0.7±0.1)g of fly ash onto the coating surface, crisscross and
evenly. After drying it under the conditions of (23±2)ºC and relative humidity of
(50±5)％ for 2 h, PLACE it on the sample frame. ADD 15L water into water tank
of flushing device. OPEN the valve to maximum to wash the sample plate.
When washing, MOVE the sample plate constantly, so as to make sure that
every part of the sample plate can go through the water flow. FLUSH for 1 min.
CLOSE the valve. DRY the plate under the conditions of (23±2)ºC and relative
humidity of (50±5)％ until the next day, this is considered 1 cycle, about 24h.
According to above brushing and flushing method, CONTINUE to test it until 5
cycles. DETERMINE the reflection coefficient of the coating test plate at 3
positions at least, TAKE its average value, DENOTE as B. Before each flushing,
the water in the tank shall be added to 15L.
A.4 calculation
The coating stain resistance is expressed by decreasing rate of reflection
coefficient.
100×−=
BAX
where. X — decreasing rate of reflection coefficient;
A — initial average reflection coefficient of coating;
B — average reflection coefficient of coating after contamination test
Result takes the arithmetic mean of 3 sample plates. The relative error of
parallel determination shall not be greater than 10％.
1) Fly ash shall be uniformly provided by the focal organization of this Standard.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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