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GB/T 5761-2018 English PDF (GBT5761-2018)

GB/T 5761-2018 English PDF (GBT5761-2018)

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GB/T 5761-2018: Suspension polyvinyl chloride resins of general purpose
This Standard specifies the classification, requirements, sampling, test methods, inspection rules, marks, packaging, transportation and storage of suspension polyvinyl chloride resins of general purpose. This Standard applies to polyvinyl chloride resins of general purpose produced by the suspension method. The polyvinyl chloride resin of general purpose produced by bulk method can also use this Standard as a reference.
GB/T 5761-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
G 32
Replacing GB/T GB/T 5761-2006
Suspension polyvinyl chloride resins of general purpose
ISSUED ON: DECEMBER 28, 2018
IMPLEMENTED ON: NOVEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Classification ... 6
4 Requirements ... 7
5 Sampling ... 8
6 Test methods ... 9
7 Inspection rules ... 10
8 Marks, packaging, transportation and storage ... 11
Annex A (normative) Determination of average degree of polymerization ... 13 Suspension polyvinyl chloride resins of general purpose
1 Scope
This Standard specifies the classification, requirements, sampling, test methods, inspection rules, marks, packaging, transportation and storage of suspension polyvinyl chloride resins of general purpose.
This Standard applies to polyvinyl chloride resins of general purpose produced by the suspension method. The polyvinyl chloride resin of general purpose produced by bulk method can also use this Standard as a reference.
2 Normative references
The following referenced documents are indispensable for the application of this Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 191, Packaging and storage marks
GB/T 2913, Test for whiteness of plastics
GB/T 2914, Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of volatile matter (including water)
GB/T 2915, Determination of conductivity of water extract of polyvinyl chloride resins
GB/T 2916, Plastic - Vinyl chloride homopolymer and copolymer resins - Sieve analysis using air-jet sieve apparatus
GB/T 3400, Plastics - Homopolymer and copolymer resins of vinyl chloride for general use - Determination of plasticizer absorption at room temperature GB/T 3401, Determination of the viscosity of Poly (vinyl chloride) resins in dilute solution using capillary viscometers
GB/T 3402.1, Plastics - Homopolymer and copolymer resins of vinyl chloride - Part 1: Designation system and basis for specifications
GB/T 4611, Determination method of fisheyes for polyvinyl chloride resins of general use
GB/T 6678, General principles for sampling chemical products
GB/T 6679, General rules for sampling solid chemical products
GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 9348, Plastics - Poly (vinyl chloride) resins - Determination of number of impurities and foreign particles
GB/T 15595, Polyvinyl chloride resins - Test methods for the thermal stability - Whiteness method
GB/T 20022, Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of apparent density
GB/T 21060, Plastics - Determination of pourability
GB/T 21843, Plastics - Vinyl chloride homopolymer and copolymer resins - Particle size determination by mechanical sieving
GB/T 29874, Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of residual vinyl chloride monomer by gas-chromatographic analysis of dry powder
JJF 1070, Rules of Metrological Testing for Net Quantity of Products in Prepackages with Fixed Content
3 Classification
The product classification code is composed of four items, including the product name specified in GB/T 3402.1, the symbol for the polymerization method and use, and the viscosity number classification number (see Table 1). The combination of polymerization method, application and viscosity number classification code is the product model.
chloride monomer shall be stored in well-sealed sample bottles, compact and fulfil). Indicate: manufacturer name, product name, model, batch number or production date, sampling volume, sampling date.
6 Test methods
6.1 Appearance
Visually observe under natural light or carry out in accordance with the provisions of GB/T 2913 agreed by the supplier and the purchaser.
6.2 Determination of viscosity number, K value and average degree of
polymerization
6.2.1 Description of determination method
Select one of the methods for measuring viscosity number, K value and average degree of polymerization. Of which, GB/T 3401 is the arbitration method.
6.2.2 Determination of viscosity number
According to the provisions of GB/T 3401.
6.2.3 Determination of K value
According to the provisions of GB/T 3401.
6.2.4 Determination of average degree of polymerization
According to the provisions of Annex A.
6.3 Determination of the number of impurity particles
According to the provisions of GB/T 9348. It can also be measured by instrumental method. Of which, GB/T 9348 is the arbitration method.
6.4 Determination of volatile matter (including water)
According to the provisions of GB/T 2914. The sample heating temperature is (110±2)℃. The time is 1h. Calculate the result according to the weight loss of 1h. 6.5 Determination of apparent density
According to the provisions of GB/T 20022.
6.6 Determination of sieve residues
According to the provisions of GB/T 2916 or GB/T 21843. Of which, GB/T 2916 is the arbitration method.
6.7 Determination of "fisheyes" number
According to the provisions of GB/T 4611.
6.8 Determination of absorption of 100g of resin plasticizer
According to the provisions of GB/T 3400.
6.9 Determination of whiteness (160℃, 10min)
According to the provisions of GB/T 15595. The sample is heated at (160±1)°C for 10min.
6.10 Determination of conductivity of water extracts
According to the provisions of GB/T 2915.
6.11 Determination of residual vinyl chloride monomer
According to the provisions of GB/T 29874.
6.12 Determination of dry flow
According to the provisions of GB/T 21060.
7 Inspection rules
7.1 Inspection classification and inspection items
7.1 Inspection classification
Inspection classification: exit-factory inspection and type inspection. 7.1.2 Exit-factory inspection
The appearance, viscosity number (or K value, average degree of polymerization), number of impurity particles, volatile matter (including water), apparent density, and number of "fisheyes" specified in this Standard are the exit-factory inspection items. They shall be inspection in batches.
7.1.3 Type inspection
All the inspection items specified in this Standard are type inspection items. Under normal production conditions, type inspection shall be conducted at least once every three months.
In one of the following situations, type inspection shall also be carried out: - when the key production process has changed;
- when the main raw materials have changed;
- when the production is resumed after production is shut downed;
- when production equipment has significant fluctuations / is adjusted. When the type inspection does not meet the requirements of this Standard, it shall be inspected for each batch. The normal inspection can only be carried out until the inspection results of five consecutive batches meet the standard requirements. 7.2 Rules for determination and reinspection
7.2.1 Rules for determination
7.2.1.1 The product quality index shall be determined according to the "rounding-off value comparison method" stipulated in GB/T 8170.
7.2.1.2 Products shall be inspected by the quality inspection department of the manufacturer according to the provisions of this Standard. Make quality judgments on products based on inspection results and standard requirements. Provide proof of quality. 7.2.1.3 When the products leave the factory, each batch of products shall be accompanied by a quality certificate. The content of the quality certificate includes manufacturer name, product name, model, grade, batch number or production date, batch size, product quality certificate of compliance with this Standard, implementation standard number. Stamp with the enterprise quality inspection seal.
7.2.2 Reinspection rules
If one of the indicators in the inspection results does not meet the requirements of this Standard, it shall be re-inspected by sampling from the batch of products with double the number of sampling units. Even if one of the indicators in the re-inspection results does not meet the requirements of this Standard, the batch of products is unqualified. 8 Marks, packaging, transportation and storage
8.1 Marks
There shall be a firm and obvious mark on the outer packaging of the exit-factory products, indicating manufacturer name, address, product name, model, net content, batch number or production date, and the serial number of this Standard. The packaging shall also have the sign of "Afraid of Rain" stipulated in GB/T 191.
A.2.4 Funnel with glass sand core: pore size is 10μm~15μm.
A.2.5 Analytical balance: division value is 0.1mg.
A.2.6 Stopwatch, division value is 0.1s.
A.3 Preparation of sample solution
Weigh (200±0.1)mg of sample. Place in a 50mL volumetric flask with a glass stopper. Add about 40mL of nitrobenzene. Heat the volumetric flask in a glycerin bath at (100±2)°C. Shake the volumetric flask intermittently to dissolve the sample completely. Take out the volumetric flask. Cool to room temperature. Then put it in a constant temperature water bath at (30±0.05)°C for about 20min. Dilute to the mark with nitrobenzene at the same temperature. Shake well for future use.
A.4 Test steps
A.4.1 Determination of solvent flowing time
A.4.1.1 Connect latex tubes to viscometer tube 2 and tube 3 respectively. Place the viscometer vertically in a constant temperature water bath at (30±0.05)°C. Make the liquid level exceed ball C of the viscometer.
A.4.1.2 Use a glass sand core funnel to filter the solvent nitrobenzene (hereinafter referred to as solvent) through tube 1 into ball A of the viscometer, until the liquid level of the solvent is between the two scale lines of ball A. Keep at constant temperature for about 10min.
A.4.1.3 Close tube 3 and pipette 2 to allow the solvent to slowly enter ball B through the capillary. When the solvent level rises to half of ball C, stop aspiration. Open tube 3. Measure the elapsed time from the upper scale line to the lower scale line of the solvent ball B.
A.4.1.4 Repeat the measurement of flowing time three times. Take the arithmetic mean value as the flowing time of the solvent.
A.4.2 Determination of flowing time of sample solution
A.4.2.1 Suck out the above solvent. Filter about 15mL of the sample solution (A.3) into the viscometer through a glass sand core funnel. Rinse the sample solution through ball B three times and then suck it out. Then filter the remaining sample solution into the viscometer ball A through the glass sand core funnel through tube 1. Keep at the constant temperature for about 10min.
A.4.2.2 Measure the flowing time of the sample solution according to A.4.1.3. A.4.2.3 Repeat the measurement of the sample solution flowing time twice. Take the arithmetic mean value as the flowing time of the sample solution.
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