GB/T 20623-2025 (GB/T 20623-2006) PDF EnglishUS$125.00 · In stock · Download in 9 seconds
GB/T 20623-2006: Emulsions for architectural coatings Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 20623: Historical versions
Similar standardsGB/T 20623-2006: Emulsions for architectural coatings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20623-2006GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.060.20 G 52 Emulsions for architectural coatings ISSUED ON: SEPTEMBER 01, 2006 IMPLEMENTED ON: FEBRUARY 01, 2007 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC; National Standardization Administration. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Requirements ... 5 4 Test method ... 5 5 Inspection rules ... 8 6 Marking, packaging, storage ... 8 Appendix A (Normative) Determination of the total amount of residual monomers .. 10 References ... 16 Emulsions for architectural coatings1 ScopeThis standard specifies the requirements, test methods, inspection rules, marking, packaging, storage of various synthetic resin emulsions with water as the dispersion medium, which are prepared by emulsion polymerization of monomers such as acrylate, methacrylate, vinyl ester of acetic acid or other organic acids, styrene. This standard applies to general synthetic resin emulsions, that play a film-forming and bonding role in building interior and exterior wall coatings.2 Normative referencesThe provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 1250 Rules for expression and judgement of limiting values GB/T 2794-1995 Determination methods for viscosity of adhesives GB 3186 Sampling paint products GB/T 9267-1988 Determination of minimum film-forming temperature of emulsion for latex paints (neq ISO 2115:1976) GB/T 9750 Marks for package of coating products GB/T 13491-1992 General rule for packing of coatings GB 18582-2001 Indoor decorating and refurbishing materials - Limit of harmful substances of interior architectural coatings HG/T 2458-1993 General rules for the inspection, transportation and storage of paint products 4.7 Freeze-thaw stability Put 50 g of the specimen into a cylindrical plastic or glass container of about 100 mL; be careful not to mix in bubbles; cover it with a lid to seal. Put it in a (-5 ± 2) °C low temperature box; take it out after 18 h; place it at (23 ± 2) °C for 6 h. After repeating this three times, open the container; stir it with a glass rod; observe whether the sample has any abnormal phenomena such as lumps and condensation. If not, it is considered "no abnormality". The sample can be spread on the glass plate into a uniform thin layer with the help of a glass rod; then the presence of floccules can be observed. 4.8 Storage stability Put about 0.5 L of the sample into a suitable plastic or glass container, leaving about 10% of the space in the bottle; seal it and place it in a (50 ± 2) °C constant temperature drying oven. After 2 weeks, take it out and place it at (23 ± 2) °C for 3 hours. Open the container and observe whether there is stratification, crusting, lumps, flocculation. The specimen can be spread on the glass plate into a uniform thin layer with the help of a glass rod; then the presence of floccules can be observed. 4.9 Dilution stability The specimen is diluted with distilled water to a non-volatile content of (3 ± 0.5)%; then the aqueous dispersion is placed in a 100 mL stoppered measuring cylinder. After standing for 72 hours, the volume of the upper clear liquid and the volume of the bottom precipitate are measured. The dilution stability is expressed as the volume fraction of the upper clear liquid and the bottom precipitate in 100 mL of the diluent; the result is rounded to an integer. 4.10 Mechanical stability Put (400 ± 0.5) g of filtered emulsion [filter with pore size of 177 μm (80 mesh)] into a suitable container of about 1000 mL (diameter of about 100 mm, height of about 180 mm); place it on the high-speed disperser base; fix it with a clamp; start the disperser (mixing head is disc-shaped, diameter of about 40 mm); adjust the speed to 2500 r/min; disperse for 0.5 h; filter again; use tap water to flush the residue on the inner wall of the container into the filter; rinse the filter with tap water; observe whether the emulsion is demulsified and whether there are obvious flocculants. 4.11 Calcium ion stability Add 30 mL of emulsion to a small beaker; then add 6 mL of 0.5% CaCl2 solution; stir well and place in a 50 mL stoppered measuring cylinder. After 48 hours, observe whether there is stratification, precipitation, flocculation, etc. The specimen can be spread on a glass plate into a uniform thin layer, with the help of a glass rod; then observe whether there is flocculation. 4.12 Total residual monomers It is carried out according to Appendix A. 4.13 Free formaldehyde It is carried out according to the provisions of Appendix B of GB 18582-2001. 4.14 Volatile organic compounds (VOC) It is carried out according to the provisions of Appendix A of GB 18582-2001.5 Inspection rules5.1 Inspection classification 5.1.1 Product inspection is divided into exit-factory inspection and type inspection. 5.1.2 Exit-factory inspection items include container status, non-volatile matter, pH value, viscosity. 5.1.3 Type inspection items include all technical requirements listed in this standard. 5.1.3.1 Under normal production conditions, 5 items — freeze-thaw stability, storage stability, dilution stability, mechanical stability, calcium ion stability — are tested once a quarter; the total residual monomer is tested once every six months; 3 items — the minimum film-forming temperature, free formaldehyde, volatile organic compounds — are tested once a year. 5.1.3.2 Type inspection shall also be carried out in other cases specified in 3.2 of HG/T 2458-1993. 5.2 Determination of inspection results It is carried out according to the rounded value comparison method in GB/T 1250.6 Marking, packaging, storage6.1 Marking It is carried out according to the provisions of GB/T 9750. 6.2 Packaging It is carried out according to the provisions of the secondary packaging requirements in GB/T 13491-1992. 6.3 StorageAppendix A(Normative) Determination of the total amount of residual monomers A.1 Principle After the sample is diluted, the prepared sample is injected into the chromatographic column using the headspace injection technique. The vinyl acetate, acrylonitrile, ethyl acrylate, methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate monomers to be tested are separated from other components by vaporization; it is detected by a hydrogen flame ionization detector and quantified by the internal standard method. A.2 Scope of application This method is applicable to the determination of the content of unreacted residual monomers (such as vinyl acetate, acrylonitrile, ethyl acrylate, methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate) in various synthetic resin emulsions. The measurement range is 0.001% ~ 1.0%. Emulsion samples with residual monomer content not in this range can be determined by this method after appropriate dilution and adjustment. A.3 Reagents and materials A.3.1 Unless otherwise specified, the reagents used shall be at least analytical grade. A.3.2 Carrier gas: High-purity nitrogen, purity ≥ 99.999%; A.3.3 Fuel gas: high-purity hydrogen, purity ≥ 99.999%; A.3.4 Fuel-supporting gas: air; A.3.5 Acetone; A.3.6 Cyclopropyl methyl ketone (CPMK); A.3.7 Distilled water (GB/T 6682, grade-3 water); A.3.8 Vinyl acetate (VAC); A.3.9 Acrylonitrile (AN); A.3.10 Ethyl acrylate (EA); A.3.11 Methyl methacrylate (MMA); A.3.12 Styrene (ST); A.3.13 Butyl acrylate (BA); A.3.14 2-Ethylhexyl acrylate (2-EHA); A.4 Instruments A.4.1 Gas chromatograph: A gas chromatograph that can meet the analysis requirements and is equipped with a hydrogen flame ionization detector. A.4.2 Sampler: A headspace sampler that can meet the analysis requirements. A.4.3 Chromatographic column: Methyl polysiloxane (35% trifluoropropyl) capillary column 60 m × 0.32 mm × 1.5 μm. A.4.4 Analytical balance: Accuracy is 0.1 mg. A.4.5 Headspace bottle: Volume is 20 mL. Note: This method is based on a headspace sampler, capillary column, FID detector. Any model of gas chromatograph, headspace sampler, chromatographic column with equivalent or superior performance that can eliminate interference peaks can be used, provided that there must be sufficient separation and sensitivity. A.5 Analysis conditions A.5.1 Headspace conditions A.5.1.1 Constant temperature box temperature: 130 °C. A.5.1.2 Quantitative tube temperature: 150 °C. A.5.1.3 Conveyor line temperature: 170 °C. A.5.1.4 Sample equilibration time: 10.0 min. A.5.1.5 Bottle pressure equilibration time: 0.20 min. A.5.1.6 Quantitative tube filling time: 0.11 min. A.5.1.7 Quantitative tube equilibration time: 0.20 min. A.5.1.8 Injection time: 1 min. A.5.1.9 Quantitative tube: 2 mL. A.5.1.10 Sample cycle: 38.0 min. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
