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    Home > Coatings News > Paints and Coatings Market > Coating standard: spray polyurea waterproof coating (GB / T 23446-2009)

    Coating standard: spray polyurea waterproof coating (GB / T 23446-2009)

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tips: 1 basis for standard formulation This standard is formulated on the basis of: First, it refers to JIS a6021-2000 waterproof coating for building and GB / T 19250-2003 polyurethane waterproof coating; second, it refers to the technical data, relevant enterprise standards and technical documents of spray polyurea elasticity at home and abroad; third, it is based on the verification test data under the premise of meeting the requirements of waterproof Engineering and combining the current domestic actual situation

    2 main contents of the standard 2.1 standard name Basis material Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form

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    The basis of this standard is as follows: 1

    Refer to JIS a6021-2000 waterproof coating for building and GB / T 19250-2003 polyurethane waterproof coating; 2

    Technical data, relevant enterprise standards and technical documents about spray polyurea elasticity at home and abroad; Third, on the premise of meeting the requirements of waterproof engineering, combined with the current domestic actual situation, based on the verification test data results

    2

    Main contents of the standard 2.1 the standard name is determined as: spray polyurea waterproof coating (JN waterproof coating for short) according to the properties, uses and characteristics of materials

    2.2 scope this standard specifies the terms and definitions, classification and marking, general requirements, technical requirements, test methods, inspection rules, marks, packaging, transportation and storage of spray polyurea waterproof coating

    This standard is applicable to spray polyurea waterproof coating for construction engineering and infrastructure

    2.3 the definition of spray polyurea water proofing coatings: it is a kind of elastomer water proofing coating that uses isocyanate compound as component A and amine compound as component B to mix and react the two components by spray construction process

    (Note 1: component A is isocyanate monomer, polymer, derivative, prepolymer or semi prepolymer

    Prepolymer or semi prepolymer is prepared by the reaction of amino or hydroxyl terminated compounds with isocyanate

    Isocyanates can be either aromatic or aliphatic

    Note 2: when component B is an amine compound composed of amino resin and amino chain extender, it is usually called spray (pure) polyurea waterproof coating; when component B is an amine containing compound composed of hydroxyl resin and amino chain extender, it is usually called spray polyurethane (urea) waterproof coating.) 2.4 product classification and marking 2.4.1 product classification 2.4.1.1 products are divided into spray (pure) polyurea waterproof coating (code JNC) and spray polyurethane (urea) waterproof coating (code JNJ) according to their composition

    2.4.1.2 products are divided into type I and type II according to physical and mechanical properties

    2.4.2 product marks shall be marked according to product code, category and standard number sequence

    Example: type I spray polyurethane (urea) waterproof coating is marked as JNJ waterproof coating I (GB / t23446-2009)

    2.5 generally, the environmental protection and personal safety problems caused by the construction and use of waterproof coating are paid more and more attention by the society and the public

    The most fundamental solution is to start from the source, i.e

    from the raw materials for production

    Although there is no solvent in polyurea spraying, a certain amount of additives should also be added

    In order to use raw materials that meet environmental protection and are harmless to human body, biology and environment, and produce waterproof coatings that meet environmental protection and safety standards, according to GB / T 19250-2003 polyurethane waterproof coating standard, refer to a St M standard and China's engineering construction code, this standard puts forward the principle regulations on the environment and safety requirements of spray polyurea waterproof coating

    2.6 technical requirements This standard has set up 22 inspection items

    The main items are appearance, solid content, gel time, dry time, tensile strength, elongation at break, tear strength, low temperature bending, water impermeability, heating rate, water absorption, bond strength, aging at the time of elongation, heat treatment, alkali treatment, acid treatment, salt treatment, artificial weathering, hardness (Shao A), abrasion resistance

    Determination of properties, impact resistance and VOC content

    Among them, the setting of these projects is mainly aimed at the requirements of waterproofing, use function, construction and product characteristics

    The technical indicators are determined by referring to the domestic waterproof engineering needs, enterprise standards and test verification data

    GB / T 19250-2003 "polyurethane waterproof coating" adopts J is a 6021-2000 "waterproof coating for building", and also refers to a s t m c836-95 "standard specification of high solid content cold liquid construction elastomer waterproof membrane shared with single wear-resistant layer"

    The physical and mechanical properties of the product are the same as Jisa in Japan, such as tensile strength, tearing strength, heating expansion rate, aging at constant elongation, heat treatment, alkali treatment and acid treatment

    The requirement of artificial climate accelerated aging is higher than JIS standard

    Taking into account the actual situation in China, compared with the standard of J I S A 6021 - 2000 "waterproof coatings for buildings", the bending strength, impermeability, wet base bonding strength, gel time, drying time and dry time were increased

    The project setting of this standard mainly adopts GB / t19250-2003 polyurethane waterproof coating standard, and the test method mainly adopts GB 16777-2008 building waterproof coating test method and GB / T 19250-2003 polyurethane waterproof coating standard

    This standard is compared with G B / T 19250 - 2003 polyurethane waterproof coating: the technical requirements increase gel time, bond strength, hardness (Shao A), abrasion resistance, impact resistance, V O C content, salt treatment and low temperature bending property after many treatments

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