Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2503—93
Polycarbonate resin
1993-09-08 Issued
Ministry of Chemical Industry of the People's Republic of China
1994-07-01 Implementation
Chemical Industry Standard of the People's Republic of China
Polycarbonate resin
Topic Content and Scope of Application
HG/T2503—93
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of polycarbonate resin (PC).
This standard applies to carbonate resins synthesized by the melt method and solvent method. 2 Reference standards
GB/T 1040 Tensile test method for plastics
GB/T 1043
Impact test method for simply supported beam of plastics
GB/T1408 Test method for power frequency breakdown voltage, breakdown strength and withstand voltage of solid electrical insulating materials GB／T1409 Test method for dielectric constant and dielectric loss tangent of solid electrical insulating materials at power frequency audio frequency high frequency GB/T1410 Test method for insulation resistance, volume resistivity and surface resistivity of solid electrical insulating materials GB/ T 1632
Standard guide and general conditions for determination of viscosity and intrinsic viscosity of dilute solutions of affinity compounds GB/ T 1634
Test method for heat deformation temperature of plastic bending load GB2918 Standard environment for state conditioning and test of plastic specimens GB/T 3682
Test method for melt flow rate of thermoplastics GB/T-7140
GB/T 9341
3 Product classification
3.1 Classification
Determination of water content in ethylene glycol terephthalate pellets Test method for plastic bending performance
According to the production process, it is divided into carbonate produced by melting method and solvent method. 3.2 Grade
According to the mass percentage of impurity particles, solution color difference, thermal degradation rate and other index values, it is divided into superior grade, first grade and qualified products.
4 Technical requirements
4.1 The resin is colorless or slightly yellow uniform transparent particles. The particle size of the resin is 3mm×3.5mm. The properties of 4.2 resin shall conform to the provisions of Table 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on September 8, 1993 and implemented on July 1, 1994. Content of impurities in the particles, %
Color difference of solution
Thermal degradation rate, %
Simple supported beam notched impact strength, /
Tensile strength. MPa
Elongation at break, %
Flexural strength, MPa
Heat deformation humidity,
Volume resistivity, ncm
Dielectric constant
Dielectric loss tangent
Dielectric strength, MV/m
5 Test method
5. 1 Preparation of test specimens
HG/ T 2503 —93
Melt-process polycarbonate
Superior grade
First grade
>7~≤12
Qualified product
>12~≤20
Agent-process polycarbonate
2. 7~ 3. 0
1. 5 × 10-2
First-class product
Qualified product
>7~≤10
>12~≤20
Prepare the sample by injection molding. Before injection molding, the sample shall be dried at 115~120℃, and the water content shall be less than 0.02% (m/m). Note: The water content shall refer to GB/T7140. The injection molding conditions shall refer to the product instructions provided by the manufacturer. 5.2 Specimen size and appearance
Specimen size and appearance requirements are listed in Table 2.
Test items
Simply supported beam notched impact strength
Tensile strength
Elongation at break
Flexural strength
Heat deformation temperature
Strip: (120±2) × (15±0.2) × (10±0.2)Notch: Arc radius not greater than 0.2
Double spade: [70×(20±0.2）×（4±0.2)Length of the middle section: 55±0.5
Width: 10±0. 2
Strip: (120±2)×(15±0.2)×(10±0.2)Quantity (one set)
Specimen surface is smooth without
gas-liquid cracks and delamination
phenomenon, and no obvious
mechanical tension and processing
damage and other defects
Test items
Volume resistivity
Dielectric strength
Dielectric constant
Dielectric loss tangent
5.3 Sample state adjustment
HG / T 2503 -- 93
Inch mm
Circle: ± (100±1) × (2±0.2)Circle: ± (50±1)×[2±0.2)
Quantity (one group)
The surface of the sample is flat and free of bubbles, cracks and delamination, and no obvious mechanical impurities and processing damage.
The samples of mechanical properties and electrical properties are conditioned and tested under normal conditions of GB2918. The conditioning time is more than 16h. 5.4 Determination of the content of impure particles
Weigh 10 samples and place them in a single layer on a X-ray projection screen or white paper. Under bright light, remove the resin particles containing impurities and weigh them on a balance. Calculate the content of impurity particles according to formula (1) and express it in mass percentage: m,
Where: m
=sample mass, :
=total amount of impurity particles,.
× 100
The average of the two measured values of the parallel test is the measurement result.5.5 Determination of solution color difference
5.5.1 Method A
5.5.1.1 Principle of the method
The difference between the chromaticity of the object to be measured and the chromaticity of the neutral color is the color difference of the object. This method measures the transmittance of 10% carbonate trichloromethane solution relative to the reference substance trichloromethane in three primary colors (445 nm, 555 nm, 600 nm) to calculate its color difference.
5.5.1.2 Reagents
Trichloromethane (GB/T682).
5.5.1.3 Instruments
Spectrophotometer;
b. Balance: Sensitivity 0.01 g
c. Volumetric flask: 25mL,
5.5.1.4 Sample preparation
Put the sample in a vacuum oven and dry it at 115°C for 3h. Weigh 2.5±0.02g of the dried sample and put it in a 25mL volumetric flask, inject about 10mL of trichloromethane, and inject 5-10mL of chloroform after it is fully swollen. Shake vigorously to promote its dissolution. Then add chloroform to the scale at 25°C. Shake and wait for measurement. 5.5.1.5 Measurement steps
a. Turn on the spectrophotometer and stabilize it for about 10 min. Place four colorimetric cells with a thickness of 3cm in the measuring light path, and measure the transmittance of the disk in three primary colors (445nm, 555nm, b.
600nm) respectively. It is required that under the same primary color, the transmittance difference between the four cells should be within 1%. Inject chloroform into one of the cells and inject the solvent to be tested into the other three cells. Cover the lid and let it stand for a while. When there is no obvious wrinkle in the cell, measure the transmittance of the chloroform colorimetric cell to 100% under each primary color light, and then measure the transmittance of each test solution. Repeat the test twice, and take the average value. The range should be less than 1%. 5.5.1.6 Calculation of test results
Calculate the solution color difference 4c (%) according to formula (2): T445
[1 Ts5s
Where: Tus is the transmittance of the solution at 445nm relative to chloroform; Tss is the transmittance of the solution at 555nm relative to chloroform; Teoo
is the transmittance of the solution at 600nm relative to chloroform; 600
T is the sum of the three transmittances of the solution under the primary color light (T=Tus+Tss+Tsp). The average value of the two data of the parallel test is the color difference of the solution. 5.5.2B method
5.5.2.1 Principle of the method
The color difference of the solution shall be calculated according to 5.5.1.A method is used to determine the color difference of several sample solutions with different color differences as the best standard for the color difference of the polycarbonate resin solution. (2) Visually observe the color of the sample solution and a series of "standard solutions". The color difference of the best standard solution with a color close to that of the sample solution is taken as the color of the sample solution. 5.5.2.2 Instruments
Colorimetric tube: 25mL with stopper.
5. 5.2. 3 Determination steps
Preparation of color difference standard solution: Select samples of different colors and determine their color difference according to method 5.5.1A. Then put each a.
solution into a stoppered colorimetric tube and seal it with paraffin. Store in a dark place. Valid for one year. b. Colorimetric determination: Place the sample solution prepared according to 5.5.1.4 in a stoppered colorimetric tube and visually compare it with a column of color difference standard solutions under the same background. The color difference of the standard solution with a color close to that of the sample solution is the color difference of the sample solution. -5.6 Determination of thermal degradation rate
5. 6.1 Principle of the method
Thermal degradation rate is an indicator to characterize the thermal stability of polycarbonate resin. It is measured by measuring the viscosity of the resin before and after heat treatment in 300±2 acetonitrile air for 30 minutes, and expressed as the percentage of the decrease in the resin viscosity. 5. 6.2 Reagents
Dichloromethane.
5.6.3 Instruments
56.3.1 Viscometer: Ubbelohde glass capillary viscometer with a flow time of dichloromethane of not less than 100 s at 25°C 5.6.3.2 Constant temperature water bath: accuracy 25±0.0 5.5.6.3.3 Thermal degradation furnace: accuracy 300±2, see Appendix A, 5. 6. 3.4 Thermometer: graduation value 1℃
5.6.4 Sample preparation
5.6.4.1 Sample drying
Place the sample with a layer thickness of about 7mm in a vacuum oven at 115℃ for 3h, and transfer it to a desiccator to cool for 0.5h. 5.6.4.2 Sample heat treatment
Take out about 1.5g of sample from the desiccator and place it on a stainless steel plate that has been preheated for 10min in a 300℃ furnace: Cover the crucible with a porcelain lid and a furnace film cover for 30 After 15 minutes, take about 0.5g of viscous resin and put it in a dryer to cool for 0.5 minutes. 5.6.5 Determination steps
HG/T2503-93
Weigh 0.1225~0.1275g of dry sample without heat treatment (accurate to 0.2mg), put it in a 25mL volumetric flask, inject about 10mL of dichloromethane to dissolve it, put this volumetric flask in a constant temperature water bath to keep the temperature at 10mm, and add the constant temperature solvent dropwise to the mark. Take out the hook and filter it into the viscometer through a No. 2 sand core funnel. Measure according to GB/T1632 Determine the viscosity number. Weigh 0.1225~0.1275g (accurate to 0.2mg) of the heat-treated solvent sample and determine the viscosity number according to the above steps. 5.6. Calculation of stone test results
Calculate the viscosity number VN according to formula (3):
Calculate the thermal degradation rate Hd (%) according to formula (4): Hd-
Where: VN——viscosity, mL/g;
solvent flow time, s;
to-solvent flow time, s;
-solution concentration, g/mL
(VN), -(VN)
(VN)Viscosity before thermal degradation, mL/g
(VN)——Viscosity after thermal degradation, mL/ g.100
The difference between the two measured values of the test shall not exceed 2%, otherwise it shall be re-measured. 5.7 Determination of simply supported beam notched impact strength
Determined according to GB/T1043,
When the difference between the measured value of a single specimen and the average value exceeds 15% of the average value, the specimen shall be removed, but the total number of removed specimens shall not exceed 40% of a group of specimens, otherwise five more specimens shall be taken for re-measurement. 5.8 Determination of tensile strength and elongation at break
According to GB/ T1040 determination, the test speed is 50mm/min, when the difference between the measured value of a single sample and the average value exceeds 11% of the average value, the sample is discarded, but the total number of discarded samples shall not exceed 40% of a group of samples, otherwise five more samples shall be taken for re-testing, 5.9 Yield bending strength determination
According to GB/T9341, the test speed is 20mm/min, when the difference between the measured value of a single sample and the average value exceeds 10% of the average value, the sample is discarded. But the total number of discarded samples shall not exceed 40% of a group of samples, otherwise five more samples shall be taken for re-testing, 5.10 Heat deformation temperature determination
According to GB/T1634,
Maximum bending normal stress: 1.81MPa
Starting temperature: room temperature to 70℃
c. Heating rate: 120±12℃/h
The difference between the two measured values of parallel tests shall not exceed 2℃, otherwise re-testing is required. 5.11 Determination of volume resistivity
Determine in accordance with GB/T1410, using a high resistance meter. The arithmetic mean of the three samples is the test result. The range of the values of the three samples shall not exceed one order of magnitude, otherwise the test must be repeated.
5.12 Determination of dielectric constant and dielectric loss tangent HG/T 2503 -- 93
Determine in accordance with GB/T1409, using a two-electrode system or resonance method, such as a Q meter. Other high-frequency testers that can obtain similar results may also be used, with a frequency of 10°Hz.
5.13 Dielectric strength determination
Measured according to GB/T1408,
Electrode size adopts (b) in Figure 1 of GB/T1408b. Test medium adopts liquid medium
c. The boost method adopts a in Chapter 14 of GB/T1408. The arithmetic mean of three samples is taken as the test result. 6 Inspection rules
6.1 The factory inspection items of this product are the content of particles containing impurities, solution color difference and thermal degradation rate. Type inspection is carried out according to the provisions of 6.6.1 in GB1.3. In normal production, the cycle of type inspection is three months. 5.5.1 Method A is the arbitration test method. 6.2 The quality supervision department of the manufacturer selects the recommended number of units for each batch according to Table 3, and the total amount is not less than 5kg: mix the samples taken and indicate the manufacturer name, product name, batch number and sampling date. For intermittently produced polycarbonate, each batch is a batch or multiple batches of mixed products are a batch.
Table 3 Provisions for selecting the number of sampling units
Number of units of the overall material
Minimum number of units to be selected
Total units
50 ~ 64
82~101
[02~125
6.3 If there are unqualified products after inspection, re-samples should be taken from double the number of packages, and the same number of trays of samples should be prepared for re-inspection. If the re-inspection results still show one unqualified item, the batch of products should be downgraded or treated as unqualified products. 64 The user unit can inspect this product according to the technical requirements specified in this standard within three months after receipt. 6.5 When the screening parties have objections to the quality. The arbitration unit shall conduct arbitration tests in accordance with the provisions of this standard. 7 Marking, packaging, transportation, storage
7.1 The packaging bag shall indicate the product name, grade, batch number, manufacturer name, net weight, and be accompanied by a product quality certificate. 7.2 The inner packaging of the product shall be a polyethylene plastic bag, and the outer packaging shall be a plastic woven bag or other strong outer bag. The net weight of each bag is 25kg. 7.3 During transportation, it shall be protected from moisture, pollution and direct sunlight, and shall be handled with care to prevent damage to the packaging. 7.4 This product should be stored in a ventilated and dry warehouse. Do not store it with flammable and corrosive items. HG/T2503-93
Appendix A
(reference)
The thermal degradation furnace can be made of an aluminum chain with a diameter of 270mm and a height of 240mm. Asbestos cloth or glass cloth is used around and at the bottom of the furnace, and asbestos board with a diameter of 270mm and a thickness of 10mm is used for heat insulation and heat preservation on the furnace surface. See Figure A1: F
Figure A1 Thermal Degradation Furnace
The thermal degradation furnace is heated by two sets of electric heating wires. One set is adjusted by a 2kV voltage-regulating transformer, and the other set is controlled by a thyristor voltage-regulating temperature controller. The schematic diagram of the furnace body surface is shown in Figure A2. Figure A2 Schematic diagram of the furnace surface of the thermal degradation furnace
A-connected to the thyristor temperature controller; B-connected to the 2kV voltage regulating transformer; C-aluminum chain; D-thermometer jack, diameter 10mm, depth 70mm; E-furnace cavity; F-small, diameter 3mm, about 3mm from the edge; G--stainless steel plate, diameter 50mm, thickness about 1mm; H-blocking cover, diameter 100mm, thickness 10mm1-asbestos board furnace head cover, diameter 100mm. Thickness 10mm; J-asbestos board, diameter 270mm, thickness 10mmHG/T 2503-93
Appendix B
Conversion relationship between viscosity number of polycarbonate resin at 25℃ and molecular weight at 20℃ (reference)
Before the formulation of this standard, some domestic manufacturers and users were accustomed to measuring the intrinsic viscosity of polycarbonate dichloromethane solution at 20℃, and then calculating the average molecular weight as the product performance indicator. In order to compare the viscosity at 25℃ with the molecular weight at 20℃, an empirical conversion formula between the two was obtained based on experiments. The empirical conversion formula between the viscosity of polycarbonate resin solution at 25℃ and the average molecular weight calculated at 20℃ is: (M)20
- 488(VN)..
- 5.61 × 10
Wherein: (M)20
（B1）
-The average molecular weight of polycarbonate calculated by measuring the intrinsic viscosity (n)n of the dichloromethane solution of carbonate at 20℃:
-The viscosity of the dichloromethane solution of polycarbonate at 25℃ The calculation formula of the intrinsic viscosity (n)2 is as follows: L
Wherein: np
1+V1+1.8m
= 1.23 × 10°(M)
The quotient of the difference between the solution flow time and the solvent flow time divided by the solvent flow time - solution concentration, g/mL
(VN)2, and (M)a Conversion table
(M)2a×10-+
HG/T2503--93
Adhesion CwwW.bzxz.Net
Determination of melt flow rate of polycarbonate resin (reference material)
C1 Refer to GB/T 3682. Among them:
CI.1 Sample drying
Put the polycarbonate sample with a material layer thickness of about 7mm into a vacuum oven and vacuum dry it at 115℃ for 3h. When measuring, take the sample directly from the oven at 115℃.
C1.2 Test conditions
Test temperature: 300±0.5;
Test load: 1200g,
The sample needs to be preheated in the material tube for 4 min;
The length of the cut piece is 10～20 mm.
Additional instructions:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Chemical Method Branch of the National Plastic Standardization Technical Committee. This standard is drafted by the Shanghai Synthetic Resin Research Institute, and the main drafters of this standard are Li You and Cai Lin. People's Republic of China
Chemical Industry Standard
Polycarbonate Resin
HG/T 2503 —93
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of Ministry of Chemical Industry)
Postal Code: 100013
Printing, Standardization Research Institute of Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format 880×12301/16 Number of words on a sheet 18000 First edition in June 1994
First printing in June 1994
Number of copies 1—500
Cost 3.80 Yuan
HG/T2503—93
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