GB/T 23981.2-2023 English PDF

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GB/T 23981.2-2023: Paints and varnishes - Determination of hiding power - Part 2: Method of black and white grid panel
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Similar standards

GB/T 23987   GB/T 23988   GB/T 23986   GB/T 23987.3   GB/T 23986.2   GB/T 23981.1   

Basic data

Standard ID: GB/T 23981.2-2023 (GB/T23981.2-2023)
Description (Translated English): Paints and varnishes - Determination of hiding power - Part 2: Method of black and white grid panel
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G50
Classification of International Standard: 87.040
Word Count Estimation: 14,144
Date of Issue: 2023-08-06
Date of Implementation: 2024-03-01
Older Standard (superseded by this standard): GB/T 1726-1979
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 23981.2-2023: Paints and varnishes - Determination of hiding power - Part 2: Method of black and white grid panel

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 87.040 CCSG50 National Standards of People's Republic of China Replace GB/T 1726-1979 Determination of hiding power of paints and varnishes Part 2.Black and white grid method Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is Part 2 of GB/T 23981 "Determination of Hiding Power of Paints and Varnishes". GB/T 23981 has released the following part. ---Part 1.Determination of contrast ratio of white and light-colored paint; ---Part 2.Black and white grid method. This document replaces GB/T 1726-1979 "Method for determination of hiding power of coatings". Compared with GB/T 1726-1979, except for structural adjustment and compilation In addition to editorial changes, the main technical changes are as follows. a) Increased scope (see Chapter 1); b) Added terms and definitions (see Chapter 3); c) Changed the requirements for glass panels (see 4.2, Chapter 1 of the 1979 edition); d) Added cup requirements (see 4.3); e) Changed the graduation value of the balance (see 4.4, Chapter 1 of the 1979 edition); f) Changed the requirements for black and white grid glass plates; changed the spraying method of black and white grid boards to black and white grid stickers, and added tests for black and white grids requirements (see 4.5, 4.6, Chapter 1 of the 1979 edition); g) Changed the requirements for camera obscura (see 4.7, Chapter 1 of the 1979 edition); h) Removed the requirement for wooden planks (see Chapter 1 of the 1979 edition) i) Added specimens (see Chapter 5); j) Added test environment (see Chapter 6); k) The test steps, calculation formulas and result expressions of the brushing method have been changed (see 7.1, Chapter 2 of the 1979 edition); l) Changed the test steps and result presentation of the spray method (see 7.2, Chapter 3 of the 1979 edition); m) Increased precision (see Chapter 8); n) Added test report (see Chapter 9). Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document is proposed by China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Coatings and Pigments Standardization Technical Committee (SAC/TC5). This document was drafted by. CNOOC Changzhou Coatings Chemical Research Institute Co., Ltd., Sichuan Guohengxin Testing and Certification Technology Co., Ltd., Anhui Shenlanhua Color Materials Co., Ltd., Zhejiang Yutong New Materials Co., Ltd., Jiangsu Ambassador Tongfeng Paint Co., Ltd., Zhejiang Saifei Electric Co., Ltd. Co., Ltd., Zhuhai Hengce Technology Co., Ltd., Biaogeda Precision Instrument (Guangzhou) Co., Ltd., Zhejiang Chaolang New Materials Co., Ltd., China Shan Yonghui Chemical Co., Ltd., Guohengxin (Changzhou) Testing and Certification Technology Co., Ltd., Shanghai Coatings Research Institute Co., Ltd., Guangzhou Longzhu Chemical Co., Ltd., Changsha Zuxing New Materials Co., Ltd., Hefei Xuyang Aluminum Pigments Co., Ltd., Guangdong Banggu Chemical Technology Co., Ltd. Company, Beijing Bihai Yunzhi New Material Technology Co., Ltd., Yixing Huayi Yipin Coloring Technology Co., Ltd., Hubei Basit Technology Co., Ltd. Company, China Railway Baoqiao Group Co., Ltd., Sichuan Product Quality Supervision, Inspection and Testing Institute, Ningbo Xinan Paint Co., Ltd., Shandong Dongjia Group Co., Ltd., Fujian Wanan Industrial Group Co., Ltd., Zhuhai Shibi Bai Color Printing Board Co., Ltd., Sinosteel Group Zhengzhou Metal Products Research Institute Co., Ltd., AkzoNobel Paint (Shanghai) Co., Ltd., Shuangta Paint Technology Co., Ltd., Shuangle Pigments Co., Ltd. Company, Meichao Group Co., Ltd., Shandong Donghong Intelligent Technology Co., Ltd., Anhui Linghu Paint Co., Ltd., Jiangsu Zhaohui Chemical Co., Ltd. Division, Jiangsu Lanling Polymer Materials Co., Ltd., Zhejiang Feiji New Material Technology Co., Ltd., Guangzhou Shenghua Industrial Co., Ltd., Yatu High-tech Materials Co., Ltd., Changzhou Tianan Special Coatings Co., Ltd., Jiangsu Kexiang Anticorrosion Materials Co., Ltd., Shanghai Microspectroscopy Detection Department Technology Group Co., Ltd., Shanghai Dabao Chemical Products Co., Ltd., Wuhan Shuanghu Paint Co., Ltd., Langfang Yanmei Chemical Co., Ltd. Company, Zhongshan Dayi Paint Co., Ltd., Zhonghua Paint (Xinfeng) Co., Ltd., Hebei Rail Transit Vehicle Equipment Co., Ltd., Ruian Baoyuan Chemical Co., Ltd., Xiamen Municipal Engineering Research Institute Co., Ltd., Fujian Jianxi Engineering Technology Co., Ltd. The main drafters of this document. Zhou Wenpei, Chen Feng, Yu Gaobo, Chen Gang, Yang Qingwei, Yang Yaliang, Dai Renxing, Wang Chongwu, Jiang Xin, Wang Guojian, Xiao Tianyou, Zhu Zhenya, Han Xudong, Wu Ruilang, Wu Zuogui, Di Taishen, Wang Zhi, Chang Yanhu, Liang Minghui, Dong Qiannian, Xue Meng, Cai Yun, Wu Yu, Xu Jinbao, Yan Chaoming, Li Huaquan, Huang Wen, Zhang Kaixiang, Li Jiaxing, Tang Mei, Xu Wenbin, Mao Shunming, Feng Shan, Liu Fengxian, Zhou Guoqing, Zhang Minhui, Liu Bin, Zeng Peigeng, Ruan Weiming, Chen Jie, Xue Ming, Min Caina, Zhang Xu, Zhang Jiaming, Que Leifeng, Wang Kaitu, Zhou Zhisheng, Si Wanqiang, Zong Shaoliang, Yao Pingcheng, Xu Liancai, Huang Qi. The previous versions of this document and the documents it replaces are as follows. ---First published as GB/T 1726-1979 in 1979; ---This is the first revision.

Introduction

Hiding power is one of the important construction properties of coating products. Coating products of the same quality, under the same construction conditions, have strong hiding ability Paint products with higher coverage can cover more area than paint products with weaker hiding power. GB/T 23981 aims to establish the covering power of coatings The determination method is intended to consist of two parts. ---Part 1.Determination of contrast ratio of white and light-colored paint. Applicable to contrast ratio of white or light-colored paint with tristimulus value Y greater than 25 Determination. ---Part 2.Black and white grid method. Suitable for measuring the hiding power of paints. This time, GB/T 1726 is revised to GB/T 23981.2, mainly considering the black and white grid method and the determination method of contrast ratio of white and light-colored paint. Compared with the other methods, the coating hiding performance reflected is similar, and it is more convenient to query and use as a series of standards. During revision, the equipment, equipment and materials were improved by improving the requirements, operating steps and calculation formulas, etc., making the technical content of the document easier to understand and operate, and can better promote the trade and technology of coating products. technology development. Determination of hiding power of paints and varnishes Part 2.Black and white grid method Warning---The use of this document may involve hazardous materials, operations, and equipment. This document is not intended to address all safety aspects associated with the use of question. Users of this document are responsible for taking appropriate steps to ensure the safety and health of personnel and to identify any other The applicability of his restrictions.

1 Scope

This document describes a method for assessing hiding power by applying paint evenly to the surface of black and white checkered panels. This document is applicable to the determination of the hiding power of paints.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. GB/T 1727 General preparation method of paint film GB/T 3186 Sampling of paints, varnishes and raw materials for paints and varnishes GB/T 9754 Determination of 20°, 60° and 85° specular gloss of paint and varnish films containing no metallic pigments GB/T 20777 Inspection and preparation of paint and varnish samples GB/T 23981.1-2019 Determination of hiding power of colored paints and varnishes Part 1.Determination of contrast ratio of white and light-colored paints

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Hiding power The ability of a coating to conceal the color or chromatic differences of a substrate. [Source. GB/T 5206-2015,2.138] 3.2 Color paint A type of paint containing pigments that when applied to a substrate forms an opaque dry paint film that has protective, decorative or special functions. [Source. GB/T 5206-2015,2.184]

4 Materials and instruments

4.1 Soft bristle paint brush Width 25mm~35mm. ......

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