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GB/T 25271-2010 (GB/T25271-2010)

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GB/T 25271-2010: PDF in English (GBT 25271-2010)

GB/T 25271-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 51
Nitrocellulose coatings
硝基涂料
ISSUED ON. SEPTEMBER 26, 2010
IMPLEMENTED ON. AUGUST 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Product classification ... 5 
4 Technical requirements ... 6 
5 Test methods ... 7 
6 Inspection rules ... 12 
7 Marks, package and storage ... 13 
Foreword
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Standardization
Technical Committees (SAC/TC 5).
The drafting organizations of this Standard. CNOOC Changzhou coating
Chemical Research Institute, Shanghai Fu-chen Chemical Co., Ltd., Nanjing
Yangtze River Paint Co., Ltd., Zhejiang GTC Paint Industry Group Co., Ltd.,
Foshan Maydos Chemical Co., Ltd., China Paint ( Shenzhen ) Co., Ltd., Jiangsu
Elephant East Asia Paint Co., Ltd., Guangzhou Pearl River Chemical Industry
Group Co., Ltd., Shenzhen Song Hui Chemical Co., Ltd., and Sichuan
Dangerous Chemicals Quality Supervision and Inspection Institute.
Main drafters of this Standard. Liu Lin, Zhou Qionghui, Zhang Haojun, Qiu
Yuqing, Liu Xiangzhi, Zhu Huiming, Yang Shaowu, Cai Minzhao, Zhang Dingde
and Wang Xiaoyun.
Nitrocellulose coatings
1 Scope
This Standard specifies the classification, requirements, test methods,
inspection rules and marks, package and storage of nitrocellulose coatings.
This Standard is applicable to modified coatings which take nitrocellulose as
main film forming materials and are added with alkyd resin, modified rosin, and
acrylic resin. The products mainly apply to metal, plastic, wood and other
surface protection and decoration.
This Standard is not applicable to protection and decoration of wood product
surface for interior decoration use (including factory coating).
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. For dated references, the
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 1722-1992 Color of varnishes, boiled oils and thinners
GB/T 1725-2007 Paints varnishes and plastics - Determination of non-
volatile-matter content (ISO 3251.2003, IDT)
GB/T 1726-1979 Methods of test for hiding power of paints
GB/T 1728-1979 Methods of test for drying time of coatings of paints and
putties
GB/T 1735-2009 Paints and varnishes - Determination of heat resistance
(ISO 3248.1998, Paints and varnishes - Determination of the effect of heat,
MOD)
GB/T 1762-1980 Test for after-tack of paint films
GB/T 1766-2008 Paints and Varnishes - Rating Schemes of Degradation of
Coats
GB 1922-2006 Petroleum solvents for paints and cleaning
GB/T 3186 Paints varnishes and raw materials for paints and varnishes -
Sampling (GB/T 3186-2006, ISO 15528.2000, IDT)
GB/T 6682 Water for analytical laboratory use - Specification and test
methods (GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 6753.1-2007 Paints varnishes and printing inks - Determination of
fineness of grind (ISO 1524.2000, IDT)
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 9271-2008 Paints and varnishes standard panels for testing (ISO
1514.2004, MOD)
GB/T 9274-1988 Paints and varnishes - Determination of resistance to
liquids (eqv ISO 2812.1974)
GB/T 9278 (GB/T 9278-2008, ISO 3270.1984, Paints and varnishes and their
raw materials - Temperatures and humilities for conditioning and testing, IDT)
GB/T 9286-1998 Paints and varnishes; Determination of resistance to liquids
(eqv ISO 2409.1992)
GB/T 9750 Marks for package of coating products
GB/T 9754-2007 Paints and varnishes - Determination of specular gloss of
non-metallic paint films at 20° 60°and 85° (ISO 2813.1994, IDT)
GB/T 13452.2-2008 Paints and varnishes - Determination of film thickness
(ISO 2808.2007, IDT)
GB/T 13491 General rule for packing of coatings
JB/T 7499-2006 Coated abrasives - Waterproof abrasive paper
3 Product classification
Nitrocellulose coating is classified into nitrocellulose primer and nitrocellulose
finish paint. And nitrocellulose finish paint is classified into varnish and paint.
5.3.1 Substrate processing
Unless otherwise agreed, steel plates, tin plates and glass plates for test use
shall comply with requirements in GB/T 9271-2008. Steel plate processing shall
be conducted in accordance with the provisions in 3.5 of GB/T 9271-2008. Tin
plate processing shall be conducted in accordance with the provisions in 4.3 of
GB/T 9271-2008. Glass plate processing shall be conducted in accordance with
the provisions in 7.2 of GB/T 9271-2008. Substrate material type and substrate
processing method agreed shall be indicated in the inspection report.
5.3.2 Preparation of test sample
Unless otherwise agreed, sample preparation shall be based on Table 3 and
determination of sample coating thickness shall be conducted according to the
provisions in GB/T 13452.2. When it uses different method for coating
preparation from the one stipulated in this Standard, it shall be indicated in the
inspection report.
Table 3 Preparation of test sample
Inspection item Substrate type
Substrate size
mm Coating requirements
Constructability
Coating
appearance
Tin plate 200×100×(0.2~0.3)
One layer of primer. (23±3) µm
Two layers of varnish. (30±5) µm (time
interval of each layer. 30 min)
Two layers of paint. (35±5) µm (time
interval of each layer. 30 min)
Conduct the test for coating appearance
after placing it for 48 h.
Adaptability to
finish paint
Steel
plate or
agreed
one
200×100×(0.2~0.3)
One layer of primer. (23±3) µm; the
thickness of supporting finish paint shall
be agreed; conduct the test after placing
it for 48 h.
Drying time Tin plate 120×50×(0.2~0.3)
One layer of primer. (23±3) µm
One layer of varnish. (15±3) µm
One layer of paint. (23±3) µm
Table 3 (continued)
Inspection
item Substrate type
Substrate size
mm Coating requirements
Cross cut
test Steel plate 120×50×(0.45~0.55)
One layer of primer. (23±3) µm; conduct
the test after placing it for 24 h.
adaptability to finish paint, it shall evaluate whether the finish paint is accessibly
applied on the primer at first. Then applying the finish paint for 48 h. Visually
observe it under natural sunlight, if there are no peeling, cracking, wrinkling,
shrinkage, spots or uneven gloss, it shall be evaluated as “no adverse effect on
finish paint”.
5.14 Grinability
Bake it for 1 h at (60±2)°C. Use P400 (No.400) water sandpaper which complies
with the provisions of JB/T 7499-2006 to grind for 30 times. If the coating is
easy to be grinded as smooth surface, it shall be evaluated as “easy to grind”.
5.15 Gloss
Conduct according to the provisions of GB/T 9754-2007.
5.16 After tack
5.16.1 Dry the varnish sample for 1 h under stipulated conditions. Put it into a
(80±2)°C oven and heat it for 30 min. Take the sample out. Place it for 1 h under
stipulated conditions. Conduct according to the provisions of GB/T 1762-1980.
5.16.2 Conduct according to the provisions of GB/T 1762-1980 for paint
sample.
5.17 Color bleeding
Spray white nitrocellulose coating of same category on the dried paint coating.
Place it for 30 min under stipulated conditions. Visually observe it under natural
sunlight, if the product for test has not bled into the white coating and caused
color change, it shall be evaluated as “no color bleeding”.
5.18 Heat resistance
Conduct the determination of heat resistance according to the provisions of
GB/T 1735-2009. Heat the varnish sample in a (115~120)°C oven for 2 h. Heat
the paint sample in a (100~105)°C oven for 2 h. Take it out and place it for 1 h
under stipulated conditions before observe it.
5.19 Water resistance
5.19.1 Dry the varnish sample for 1 h under stipulated conditions. Heat it in a
(80±2)°C oven for 30 min. Take the sample out. Then place it for another 1 h
under stipulated conditions. Conduct it according to the immersion method of
GB/T 9274-1988. Immerse it into the grade three water that complies with GB/T
6682 for 18 h, and take it out. Make it recover for 2 h and examine the coating.
If there are no wrinkles, blistering, cracking, spalling, obvious discoloration,
clear gloss coating changes or other pathological phenomena to at least 2
samples out of 3, it shall be evaluated as “no abnormality”.
5.19.2 For paint sample, conduct it according to the immersion method of
GB/T 9274-1988. If there are no wrinkles, blistering, cracking, spalling, obvious
discoloration, clear gloss coating changes or other pat...
......
 
(Above excerpt was released on 2016-04-30, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT25271-2010