This standard applies to coating systems applied to the inner surface of ships' drinking tanks. GB 5369-1985 General technical conditions for marine drinking water tank coatings GB5369-1985 Standard download and decompression password: www.bzxz.net

UDC667.61:629.12.04
C
National Standard of the People's Republic of China
GB5369—85
General Technical Conditions for Marine Drinking Tank Coatings
Shipbuilding- Coatings for drinking watertanks-General requirements
Released on 1985-09-11
National
National Bureau of Standards
Approved
Implemented on 1986-06-01| |tt||National Standard of the People's Republic of China
General Technical Conditions for Marine Drinking Tank Coatings
Shipbullding--Coatings for drinking watertanks--General requirements
This standard applies to coatings on ships Coating systems for interior surfaces of drinking water tanks. 1Technical requirements
1.1 General requirements
UDC667.61:629
.12.04
GB5369-85
1.1.1 Composition of drinking water tank coating system Determined by the production unit. Unless otherwise specified, the coating properties, test methods, etc. specified in this standard refer to the drinking water tank coating supporting system. 1.1.2 Drinking water tank coatings should be able to dry and solidify under normal natural (or industrial) environmental conditions. 1.1.3 The coating interval of each coating in the drinking water tank should be shortened as much as possible when meeting the technical requirements of the product, and the longest should not exceed 24 hours. 1.1.4 Shop primers containing lead, chromium and other toxic materials shall not be matched with the drinking water tank paint, and the thickness of each coating shall comply with the product technical requirements.
1.1.5 No or less volatile organic solvents should be used in drinking water tank coatings. 1.2 Performance requirements of the coating
1.2.1 Adhesion: The adhesion between the coating and the substrate and the coating shall not be less than 3MPa (~30kgf/cm2). 1.2.2 Flexibility: The coating shall not have reticulation, cracks or peeling after being bent on a mandrel with a curvature radius of 2.5mm. 1.2.3 Salt spray resistance: After the coating has undergone a continuous 600h salt spray test, the degree of appearance damage should comply with the first-level requirements of Chapter 3 of GB1740-79 "Determination Method for Heat and Moisture Resistance of Paint Films".
1.2.4 Water resistance: After the coating is soaked in distilled water at 25±1℃ for 30 days, no blistering, rusting or peeling should occur. 1.2.5 Hygienic requirements; coatings must undergo hygienic appraisal, see Appendix A (Supplement), and obtain a license issued by a health department recognized by the Ministry of Health.
a． In addition to complying with the current "Hygienic Standards for Drinking Water", the quality of the immersion water should also be tested for unique leachables in the water based on the composition of the paint.
b． If necessary, conduct toxicology experiments on toxic substances dissolved in the immersion water and coating to ensure that the coating is safe and harmless to the human body. 2 Test method
2.1 Adhesion test
The test is in accordance with GB5210-85 "Measurement of Coating Adhesion—Adhesive Pull-Away Method". 2.2 Flexibility test
The test is based on GB1731-79 "Method for determination of paint film flexibility". Paint film preparation shall be based on product technical requirements. 2.8 Salt spray resistance test
The test is based on GB-1771-79 "Determination of Salt Spray Resistance of Paint Films". Paint film preparation shall be based on product technical requirements. 2.4 Water resistance test
The test is based on GB1733-79 "Determination of Water Resistance of Paint Films". Paint film preparation shall be based on product technical requirements. 2.5 Hygiene Requirements
The test methods for hygienic requirements of coatings are shown in Appendix A (Supplement). National Bureau of Standards issued on September 11, 1985
Implemented on 1986-06-01bzxZ.net
Inspection rules
3
GB5369-85
for drinking water tank coatings The performance inspection shall be the responsibility of the production unit, and the inspection shall be conducted on the coating surface of the drinking water tank after drying. 3.1
3.2 During the technical appraisal of new products, they must comply with the provisions of 1.2 of this standard. Mass production can only be carried out after passing the test. 3.3 Mass production must be carried out according to the raw materials, formulas and processes specified in the technical appraisal. And carry out regular inspections in accordance with the requirements of Section 1.2.5 a. The test method is in accordance with the provisions of Appendix A, but the light-proof standing time and inspection items of the coating immersion test are determined by the information provided during the hygienic appraisal of the new product.
When the user makes a request for re-inspection of product quality, the production unit shall accept it. 3.4
4 Technical documents
The production unit should provide the following technical documents: product instructions for use, including the main components of the product, technical indicators, construction requirements, packaging, marking, transportation, storage a.||tt || and precautions, etc.
b． Factory certificate of conformity.
Preparation of A.1 test sample
GB536985
Appendix A
Requirements for hygienic qualification of coatings
(supplement)
Press The technical requirements of the product are to prepare a test sample and apply the same drinking water tank paint on both sides and end faces of the bottom plate. A.2 Preparation of sample water
Place tap water that meets the requirements of the "Drinking Water Hygienic Standards" for a certain period of time to allow chlorine gas to escape so that there is no residual chlorine in the water. Then prepare the following two sample waters for soaking the coating. a, Sample water without residual chlorine.
Add a certain amount of bleaching powder to the defluorinated tap water to make the residual chlorine content reach 0.3mg/1. b.
A.3 Soaking conditions
The amount of soaking water is calculated according to the contact area of ??the test sample (10ml/cm2). a.
Soaking temperature: 25±1℃. | |tt | Place the water in a glass vessel and seal it with a lid. And under the same conditions, keep the sample water of the same period as the blank control water. Let it stand in the dark for 30 to 90 days (the necessary soaking time is determined based on the dynamic changes in the coating's extractable content). Take the soaking water on the test day, 1, 3, 7, 15, 30, 60 and 90 days respectively. and blank control water for dynamic detection. In addition to measuring the relevant items stipulated in the "Drinking Water Hygienic Standards" based on the coating ingredients and the current "Drinking Water Quality Inspection Methods", the unique dissolved matter in the water should also be tested.
Based on the test results, especially the characteristics and concentration of the dissolved matter, the main content of the health appraisal is determined. If necessary, take the soaking water with the highest concentration of coating leachate and toxic substances in the coating leachate, and refer to the "Food Safety Toxicology Evaluation Procedure" [Ministry of Health (83) Defense No. 3 Notice] for poisoning Science experiment. Additional notes:
This standard is proposed by China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the National Coatings and Pigments Standardization Technical Committee. This standard was drafted by Bohai Shipyard and Luoyang Ship Materials Research Institute. The main drafters of this standard are Sun Zuxin, Xu Xisheng, Qin Yuhui, Wang Zishi and Ju Huiyao. 3
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