Some standard content:
National Standard of the People's Republic of China
Polystyrene resin
Polystyrene resin
1 Subject content and scope of application
GB 12671—90
This standard stipulates Technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for polystyrene resin. This standard applies to amorphous styrene homopolymers and amorphous styrene homopolymers with colorants or additives. This standard does not apply to styrene copolymers, homopolymers of styrene derivatives, polystyrene resins modified with elastomeric polymers, and polystyrene resins used for foaming.
2 Reference standards
GB/T1409·Test method for relative dielectric coefficient and dielectric loss tangent of solid electrical insulation materials at power frequency, audio frequency and high frequency GB/T 1633
GB/T1843
GB/T 2410
GB/T 2547
Test method for softening point of thermoplastic plastics (Vicat) Plastic Izod impact test method
Transparent plastic Luminous rate and haze test method Plastic resin sampling method
GB 2918
Standard environment for conditioning and testing of plastic specimens Thermoplastic melt flow rate test method GB/T 3682||tt| |GB/T 6594
GB/T 9341
GB 9692
3 Technical requirements
Nomenclature of polystyrene molding and extrusion materials
Test method for plastic bending properties
Hygiene standards for polystyrene resin for food packaging 3.1 Polystyrene resin is columnar particles, the size of the particles is 2 to 5 mm in any direction, and does not contain mechanical impurities. 3.2 Polystyrene resin with hygienic requirements should comply with GB9692 standard. 3.3 The quality indicators of this resin should comply with the requirements in the table. Wei number
serial number
refers to
item
cleanliness
standard
from
level
Special
Impurities, particles/100g≤
Color particles, particles/100g≤
Softening point (Vicat),
Bending strength, MPa
Izod impact strength, J/m≥
PS-GN,095-03
Excellent
Grade
1
97.0
88.0
State Bureau of Technical Supervision approved 286
level
3
3
94.0
86.0||tt on 1990-12-30 ||合
Gate
6
91.0
84.0
PS-GN,095-06
Excellent
Level
1
1
96.0
86.0
10
WWW.
Level
3
3
93.0
84
合
grid
6
6
90.0|| tt||82.0
Free download of quasi-industry information
PS-GN,085-03
Excellent
Level
1
88.0
83.0
level
3
3
85.0
80.0
合
发|| tt||6
6
82.0
78.0
PS-GN,085-06
level
1||tt| |1bzxz.net
85.0
82.0
13
level
3
3
82.0
80.0
Grid
6
6
79.0
78.0
Implemented on 1991-10-01
Serial number||tt ||5
6
refers to
item
label
brand
number
level
Special
Melt flow rate, g/10min
Light transmittance, %
Dielectric constant (10°Hz)
Dielectric loss tangent (10°Hz )
GB 12671-90
continuation table
PS-GN,095-03
Excellent
Grade
Grade||tt ||1.5~4.0
4.5×10-4
Good
Grid
PS-GN,095-06
Excellent
Level
85
2.6
Level
4. 0~7. 0
5.0X10-4
合||tt| |Gate
PS-GN,085-03
Excellent
Grade
Note: Items 1, 2, 3, 4 and 5 in the table are for each batch Inspection items, items 6, 7, and 8 are type inspection items. 4 Test methods
4.1 Injection molding sample preparation
adopts one-time injection molding method and makes the following provisions: a.
b.
c.
Resin melt temperature: 170±10℃;
Injection pressure (gauge pressure): 4±1MPa;
Mold temperature: 45±5℃.
4.2 Sample condition adjustment and test environment
According to the regulations of GB2918, the sample condition adjustment time shall not be less than 16 hours. 4.3 Cleanliness test
4.3.1 Appliances
a.
c.
4.3.2
a.
b.| |tt||c.
0.2mm graduated magnifying glass:
350mm×250mm white porcelain plate
Pharmaceutical balance, sensitivity is 1g.
Test steps
Weigh 100g of the sample on the balance;
Pour the weighed sample into a white porcelain plate and flatten it, and pick out the impurities and color particles. If necessary, use a graduated magnifying glass to detect the size of impurities. Level
1.5~~4.0
4.0×10-4
合
Gate
87
PS-GN,085-06
Excellent
Level
2.6
Level
4. 0~~7. 0
4.5×10-4||tt ||合
格
Note: Impurities refer to other substances that are non-bulk resin with a diameter of 0.2~1 mm mixed in the particles. Colored particles refer to particles with more than a quarter of the particles dyed with color, such as oil stain oxidation colored particles, etc. 4.3.3 Report
The number of impurities and color particles detected is expressed in particles/100g. 4.4 Bending strength test
4.4.1 Specimen
Prepare the test strip with a length of 80+2mm, a width of 10±0.5mm, and a thickness of 4±0.2mm according to the provisions of 4.1. 4.4.2 Test
shall be carried out in accordance with the provisions of GB/T9341.
4.5 Softening point (Vicat) test
4.5.1 Sample
Prepare a sample with a length and width of not less than 10mm×10mm and a thickness of 3~~6mm according to the provisions of 4.1 . 4.5.2 Test
Conducted in accordance with GB/T1633, using the following conditions: 287
.1
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Heating rate: 5±0.5C/ 6min;
a.
b． Load: 5 000*°g.
4.6 Izod impact strength test
4.6.1 Sample
GB 12671—
90
Prepared according to the provisions of 4.1 to comply with the requirements of GB/T1843 The strip sample has a width of 6.35mm and is processed into a standard notch with a milling cutter.
4.6.2 Test
Conducted in accordance with GB/T1843.
4.7 Melt flow rate test
is carried out in accordance with the regulations of GB/T3682, and adopts the conditions of a temperature of 200°C and a load of 5000g. 4.8 Light transmittance test
4.8.1 Sample
Prepare a test piece of $50±1mm with a thickness of 2±0.2mm according to the provisions of 4.1. 4.8.2 Test
shall be carried out in accordance with the provisions of GB/T2410.
4.9 Dielectric constant and dielectric loss tangent test 4.9.1 Sample
Prepare a sheet sample of 50±1mm and 2±0.2mm thick according to the provisions of 4.1. 4.9.2 Test
shall be carried out in accordance with the provisions of GB/T1409, and the following conditions shall be adopted: a.
b.
c
Using the variable electromagnetic method, using a micrometer Micrometer electrode of dynamic capacitor. The measurement frequency is 10°Hz.
The sample should be scrubbed clean and pasted with aluminum foil using Vaseline. 4.9.2.1 The dielectric constant is calculated according to formula (1): C
where: ε—
C
dielectric constant;
- when the sample is connected Capacitor reading of the sample in parallel, uF. C. Reading of the capacitor connected in parallel with the electrode system when no sample is connected, μF. Ca-
Geometric capacitance of the sample, μF.
4.9.2.2 Dielectric loss angle tangent is calculated according to formula (2): tgo
Where: tgo—dielectric loss angle tangent;
q—detuning degree; ||tt| |AC, — AC,
2Cx × Vq-1
△C, the degree of detuning is q, the width of the resonance curve when there is a sample, μF; AC2—the degree of detuning is 9, without The width of the resonance curve of the sample, μFCx sample capacitance, μF.
4.10 Result expression
The result expression should be consistent with the units and significant figures listed in the corresponding items in the table. 5 Inspection Rules
5.1 Sampling
288
Accurate operation
(1)
(2)
GB 12671--90
Polystyrene resin products should be sampled in batches based on production time or storage silo, or each batch on the production line. Sampling after packaging should be carried out in accordance with GB/T2547. 5.2 Inspection and grading
Based on the quality inspection results of each batch, compare the quality indicators in the table to make quality grade judgments of superior, first-class, and qualified. 5.3 Re-inspection
If any of the inspection results does not meet the quality indicators of this standard, re-sample from twice the amount of packaging units according to the GB/T2547 method, and re-inspect the item. If the result still does not meet the requirements, the batch of products should be downgraded. 5.4 Delivery acceptance
The manufacturer shall hand over the quality certificate to the user. The certificate shall indicate the product name, brand number, batch number and grade, and shall be stamped with a special quality inspection seal and an inspector's seal. When the user accepts the resin according to the brand name and the technical requirements stipulated in this standard, if he has any objections, he must submit them to the manufacturer within one year after the product leaves the factory.
6 Marking, Packaging, Transportation and Storage
6.1 Mark
The name of the manufacturer, product name, trademark, product grade, batch number, and net weight should be printed on each packaging bag and production date. 6.2 Packaging
Polystyrene resin is packed in plastic woven bags lined with polyethylene film bags or other suitable packaging bags. The net weight of each bag is 25kg. Large packaging of other weights can also be used.
6.3 Transportation
Polystyrene resin is a non-dangerous product. During the loading and unloading process, it is strictly forbidden to use sharp tools such as iron hooks, and do not throw them to avoid damaging the packaging bags. During transportation, they must not be exposed to the sun or rain, and must not be mixed with sand, broken metal, coal, glass, etc., and must not be mixed with toxic, corrosive, or flammable materials.
6.4 Storage
Polystyrene resin should be stored in a ventilated and dry warehouse, away from fire sources and protected from direct sunlight. It should not be stacked in the open. Additional notes:
This standard is proposed by China Petrochemical Corporation. This standard is under the jurisdiction of the Petrochemical Plastic Resin Products Sub-Technical Committee of the National Plastics Standardization Technical Committee. This standard is drafted by the chemical plant of Shanghai Gaoqiao Petrochemical Company. The main drafter of this standard is Shen Junhui.
289
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