Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 9756-2009 Synthetic resin emulsion coatings for interior wall; in addition to editorial modifications, the following technical changes have been made with respect to GB/T 9756-2009:
——The scope of the standard is modified (see Clause 1; Clause 1 of Edition 2009);
——Normative references GB/T 1250 and JC/T 412.1-2006 are deleted (see Clause 2 of Edition 2009);
——Normative references GB/T 6682-2008, GB/T 8170-2008 and GB/T 23981-2009 are added (see Clause 2);
——Low temperature film forming tests, indexes and test methods for primer and finish paint are added (see 4.1, 4.2 and 5.5.5);
——The technical index of scrub resistance test of finish paint is changed, with the acceptable product index changed from “≥300” to “≥350”, first-grade product index changed from “≥1,000” to “≥1,500”, and superior product index changed from “≥5,000” to “≥6,000” (see 4.2; 4.2 of Edition 2009);
——The specifications of waterproof abrasive paper used for substrate polishing of scrub resistance test and the inspection method for substrate planeness are added (see 5.3);
——The contents such as wet film thickness, sample density and unit of test plate area in the calculation formula of primer brushing mass are changed (see 5.4.2.1; 5.2.2.4 of Edition 2009);
——The plate preparation requirements for arbitration inspection of contrast ratio and scrub resistance tests are added (see 5.4.3.2);
——The thickness of the test plate for the scrub resistance test is changed from "430mm×150mm×(4~6)mm” to “430mm×150mm×6mm” (see Table 5; Table 5 of Edition 2009);
——Requirements for brushes for arbitration inspection of scrub resistance test are added (see 5.5.11);
——The treatment requirements for PVA water solution for alkali burnout resistance test in case of lump and sediment during storage period are added (see A.1.1.1; A.1.1.1 of Edition 2009);
——The storage period of PVA-iron blue water solution is changed from “not more than 1 month” to “not more than 15d” (see A.1.1.2; A.1.1.2 of Edition 2009);
——The height of the test plate immersed in the test solution in alkali burnout resistance test is changed from “shall be greater than one half of the test plate thickness” to “shall be greater than two thirds of the test plate thickness” (see A.3.2; A.3.2 of Edition 2009).
This standard was proposed by China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of National Technical Committee on Paints & Pigments of Standardization Administration of China (SAC/TC5).
The previous editions of this standard are as follows:
——GB/T 9756-1988, GB/T 9756-1995, GB/T 9756-2001 and GB/T 9756-2009.
Synthetic resin emulsion coatings for interior wall
1 Scope
This standard specifies the product classification and grading, requirements, test methods, inspection rules as well as marking, packaging and storage of the synthetic resin emulsion coatings for interior wall.
This standard is applicable to the coatings for interior wall, which are made from a mixture of pigments, extender pigment and various additives with the synthetic emulsion as base material and formed into a thin coating layer with smooth surface after application, including primer and finishing coat.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1728-1979 Methods of test for drying time of coatings of paints and putties
GB/T 1766-2008 Paints and varnishes - Rating schemes of degradation of coats
GB/T 1910 Newsprint
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods
GB/T 6750-2007 Paints and varnishes - Determination of density - Pyknometer method
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9265-2009 Determination for alkali resistance of film of architectural paints and coatings
GB/T 9266-2009 Determination of scrub resistance of film of architectural paints and coatings
GB/T 9268-2008 Determination of freeze-thaw resistance of latex and emulsion paints
GB/T 9271-2008 Paints and varnishes - standard panels for testing
GB/T 9278 Temperatures and humidities for conditioning and testing of paint specimens.
GB/T 9750 Marks for package of coating products
GB/T 13491-1992 General rule for packing of coatings
GB/T 15608 The Chinese color system
GB/T 23981-2009 Determination of contrast ratio of white and light coloured paints
HG/T 3001-1999 Iron blue pigments
3 Product classification and grading
This standard classifies the synthetic resin emulsion coatings for interior wall into primer and finish paint. The finish paint is classified into acceptable product, first-grade product and superior product according to the application requirements.
4 Requirements
4.1 The primer shall be in accordance with those specified in Table 1.
Table 1 Requirement for the primer
Item Index
Condition in container no lump and uniformly mixed after stirring
Constructability Easy for brushing
Low temperature stability (3 cycles) Free of deterioration
Low temperature film forming Normal film formation at 5℃
Film appearance Normal
Drying time (surface dry)/h ≤ 2
Alkali resistance (24h) Normal
Alkali burnout resistance (48h) Normal
4.2 The finish paint shall be in accordance with those specified in Table 2.
Table 2 Requirement for finish paint
Item Index
Acceptable product First-grade product Superior product
Condition in container No lump and uniformly mixed after stirring
Constructability Easy for brushing the second pass
Low temperature stability (3 cycles) Free of deterioration
Low temperature film forming Normal film formation at 5℃
Film appearance Normal
Drying time (surface dry)/h ≤ 2
Contrast ratio (white and light color a) ≥ 0.90 0.93 0.95
Alkali resistance (24h) Normal
Scrub resistance/time ≥ 350 1,500 6,000
a Light color refers to the color of film formed by the light-color coating which is prepared by white coating (main component) and color paste (proper amount); its brightness is 6~9 (one of the tristimulus values, YD65≥31.26) according to the requirements in GB/T 15608-1995.
5 Test methods
5.1 Sampling
Product sampling shall be conducted according to the requirements of GB/T 3186 or with the agreed method. The sampling quantity shall be determined as required by inspection.
5.2 Test environment
Unless otherwise specified, the conditioning of the test plate and temperatures and humidity for the test shall meet the requirements of GB/T 9278.
5.3 Test substrate and processing methods
Unless otherwise specified, substrate shall be selected in accordance with Tables 3 and 5. The contrast ratio test shall be carried out with polyester film or cart paper conforming to those specified in 4.4 of GB/T 23981-2009, alkali burnout resistance test with non-asbestos fiber-reinforced medium-density cement plate (A.1.3), and other tests all with non-asbestos fiber cement plate, which shall be made of material and subjected to treatment according to the requirements of GB/T 9271-2008. As for the scrub resistance test, the substrate shall be polished with No.120 waterproof abrasive paper; prior to plate preparation, the flat and smooth substrate shall be adopted, with its planeness inspected with the following method: place a straightedge of longer than 430mm perpendicular to the non-asbestos fiber cement plate, with its longer side clinging to the plate surface, move it in the directions parallel to the long side and short side of the plate, respectively, and observe the clearance between the straightedge and the plate. If there is no obvious clearance upon visual inspection, it is deemed as meeting the requirements for planeness.
5.4 Preparation of test plate sample
5.4.1 Preparation of specimen
if the dilution ratio of the products under inspection is not specified, they shall be mixed uniformly for plate preparation; if it is specified, they shall be mixed uniformly at the specified dilution ratio for plate preparation to carry out the tests (except for contrast ratio test) requiring plate preparation; if the dilution ratio range of the product under inspection is specified, the medium value shall be taken.
5.4.2 Preparation of test plate samples for primer
5.4.2.1 Brush coating method may be adopted to prepare the test plate for primer. For each sample, the density D is determined according to GB/T 6750-2007 and then the brushing mass m is calculated using Formula (1):
Foreword II 1 Scope 2 Normative references 3 Product classification and grading 4 Requirements 5 Test methods 6 Inspection rules 7 Marking, packaging and storage Annex A (Normative) Alkali burnout resistance test methods
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 9756-2009 Synthetic resin emulsion coatings for interior wall; in addition to editorial modifications, the following technical changes have been made with respect to GB/T 9756-2009:
——The scope of the standard is modified (see Clause 1; Clause 1 of Edition 2009);
——Normative references GB/T 1250 and JC/T 412.1-2006 are deleted (see Clause 2 of Edition 2009);
——Normative references GB/T 6682-2008, GB/T 8170-2008 and GB/T 23981-2009 are added (see Clause 2);
——Low temperature film forming tests, indexes and test methods for primer and finish paint are added (see 4.1, 4.2 and 5.5.5);
——The technical index of scrub resistance test of finish paint is changed, with the acceptable product index changed from “≥300” to “≥350”, first-grade product index changed from “≥1,000” to “≥1,500”, and superior product index changed from “≥5,000” to “≥6,000” (see 4.2; 4.2 of Edition 2009);
——The specifications of waterproof abrasive paper used for substrate polishing of scrub resistance test and the inspection method for substrate planeness are added (see 5.3);
——The contents such as wet film thickness, sample density and unit of test plate area in the calculation formula of primer brushing mass are changed (see 5.4.2.1; 5.2.2.4 of Edition 2009);
——The plate preparation requirements for arbitration inspection of contrast ratio and scrub resistance tests are added (see 5.4.3.2);
——The thickness of the test plate for the scrub resistance test is changed from "430mm×150mm×(4~6)mm” to “430mm×150mm×6mm” (see Table 5; Table 5 of Edition 2009);
——Requirements for brushes for arbitration inspection of scrub resistance test are added (see 5.5.11);
——The treatment requirements for PVA water solution for alkali burnout resistance test in case of lump and sediment during storage period are added (see A.1.1.1; A.1.1.1 of Edition 2009);
——The storage period of PVA-iron blue water solution is changed from “not more than 1 month” to “not more than 15d” (see A.1.1.2; A.1.1.2 of Edition 2009);
——The height of the test plate immersed in the test solution in alkali burnout resistance test is changed from “shall be greater than one half of the test plate thickness” to “shall be greater than two thirds of the test plate thickness” (see A.3.2; A.3.2 of Edition 2009).
This standard was proposed by China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of National Technical Committee on Paints & Pigments of Standardization Administration of China (SAC/TC5).
The previous editions of this standard are as follows:
——GB/T 9756-1988, GB/T 9756-1995, GB/T 9756-2001 and GB/T 9756-2009.
Synthetic resin emulsion coatings for interior wall
1 Scope
This standard specifies the product classification and grading, requirements, test methods, inspection rules as well as marking, packaging and storage of the synthetic resin emulsion coatings for interior wall.
This standard is applicable to the coatings for interior wall, which are made from a mixture of pigments, extender pigment and various additives with the synthetic emulsion as base material and formed into a thin coating layer with smooth surface after application, including primer and finishing coat.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1728-1979 Methods of test for drying time of coatings of paints and putties
GB/T 1766-2008 Paints and varnishes - Rating schemes of degradation of coats
GB/T 1910 Newsprint
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods
GB/T 6750-2007 Paints and varnishes - Determination of density - Pyknometer method
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9265-2009 Determination for alkali resistance of film of architectural paints and coatings
GB/T 9266-2009 Determination of scrub resistance of film of architectural paints and coatings
GB/T 9268-2008 Determination of freeze-thaw resistance of latex and emulsion paints
GB/T 9271-2008 Paints and varnishes - standard panels for testing
GB/T 9278 Temperatures and humidities for conditioning and testing of paint specimens.
GB/T 9750 Marks for package of coating products
GB/T 13491-1992 General rule for packing of coatings
GB/T 15608 The Chinese color system
GB/T 23981-2009 Determination of contrast ratio of white and light coloured paints
HG/T 3001-1999 Iron blue pigments
3 Product classification and grading
This standard classifies the synthetic resin emulsion coatings for interior wall into primer and finish paint. The finish paint is classified into acceptable product, first-grade product and superior product according to the application requirements.
4 Requirements
4.1 The primer shall be in accordance with those specified in Table 1.
Table 1 Requirement for the primer
Item Index
Condition in container no lump and uniformly mixed after stirring
Constructability Easy for brushing
Low temperature stability (3 cycles) Free of deterioration
Low temperature film forming Normal film formation at 5℃
Film appearance Normal
Drying time (surface dry)/h ≤ 2
Alkali resistance (24h) Normal
Alkali burnout resistance (48h) Normal
4.2 The finish paint shall be in accordance with those specified in Table 2.
Table 2 Requirement for finish paint
Item Index
Acceptable product First-grade product Superior product
Condition in container No lump and uniformly mixed after stirring
Constructability Easy for brushing the second pass
Low temperature stability (3 cycles) Free of deterioration
Low temperature film forming Normal film formation at 5℃
Film appearance Normal
Drying time (surface dry)/h ≤ 2
Contrast ratio (white and light color a) ≥ 0.90 0.93 0.95
Alkali resistance (24h) Normal
Scrub resistance/time ≥ 350 1,500 6,000
a Light color refers to the color of film formed by the light-color coating which is prepared by white coating (main component) and color paste (proper amount); its brightness is 6~9 (one of the tristimulus values, YD65≥31.26) according to the requirements in GB/T 15608-1995.
5 Test methods
5.1 Sampling
Product sampling shall be conducted according to the requirements of GB/T 3186 or with the agreed method. The sampling quantity shall be determined as required by inspection.
5.2 Test environment
Unless otherwise specified, the conditioning of the test plate and temperatures and humidity for the test shall meet the requirements of GB/T 9278.
5.3 Test substrate and processing methods
Unless otherwise specified, substrate shall be selected in accordance with Tables 3 and 5. The contrast ratio test shall be carried out with polyester film or cart paper conforming to those specified in 4.4 of GB/T 23981-2009, alkali burnout resistance test with non-asbestos fiber-reinforced medium-density cement plate (A.1.3), and other tests all with non-asbestos fiber cement plate, which shall be made of material and subjected to treatment according to the requirements of GB/T 9271-2008. As for the scrub resistance test, the substrate shall be polished with No.120 waterproof abrasive paper; prior to plate preparation, the flat and smooth substrate shall be adopted, with its planeness inspected with the following method: place a straightedge of longer than 430mm perpendicular to the non-asbestos fiber cement plate, with its longer side clinging to the plate surface, move it in the directions parallel to the long side and short side of the plate, respectively, and observe the clearance between the straightedge and the plate. If there is no obvious clearance upon visual inspection, it is deemed as meeting the requirements for planeness.
5.4 Preparation of test plate sample
5.4.1 Preparation of specimen
if the dilution ratio of the products under inspection is not specified, they shall be mixed uniformly for plate preparation; if it is specified, they shall be mixed uniformly at the specified dilution ratio for plate preparation to carry out the tests (except for contrast ratio test) requiring plate preparation; if the dilution ratio range of the product under inspection is specified, the medium value shall be taken.
5.4.2 Preparation of test plate samples for primer
5.4.2.1 Brush coating method may be adopted to prepare the test plate for primer. For each sample, the density D is determined according to GB/T 6750-2007 and then the brushing mass m is calculated using Formula (1):
Contents of GB/T 9756-2018
Foreword II
1 Scope
2 Normative references
3 Product classification and grading
4 Requirements
5 Test methods
6 Inspection rules
7 Marking, packaging and storage
Annex A (Normative) Alkali burnout resistance test methods
