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GB/T 25271-2010 PDF English


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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... ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.