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This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This document is Part 7 of GB/T 40006 Plastics — Recycled plastics. The following parts of GB/T 40006 have been published:
——Part 1: General rules;
——Part 2: Polyethylene (PE) materials;
——Part 3: Polypropylene (PP) materials;
——Part 5: Acrylonitrile-butadiene-styrene (ABS) materials;
——Part 6: Polystyrene(PS) and impact-resistant polystyrene(PS-I) materials;
——Part 7: Polycarbonate (PC) materials;
——Part 8: Polyamide (PA) materials;
——Part 9: Poly (ethylene terephthalate) (PET) materials.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 15).
Introduction
Plastic industry is an important pillar field of national economy. As this industry develops rapidly and plastic products are extensively used in China, their recycling becomes an important problem as well as one method of facilitating sustainable development of plastics; meanwhile, it provides an effective way to address environmental protection problems such as "white pollution".
At present, there is no domestic product standard for plastic recycling as well as no standard to follow in this industry. Therefore, a series of national standards of GB/T 40006 Plastics — Recycled plastics are thus formulated. According to the characteristics of plastic products, this series of standards is proposed to be composed of 12 parts, among which Part 1: General rules stipulates the general requirements such as designation, terminology and odor grade, content of restricted substances, radioactivity, etc., while the rest of the standards stipulate the technical requirements of recycled plastics of this material according to the type of plastics in addition to the common requirements of General rules.
This series of standards intends to consist of the following 12 parts under the general title "Plastics — Recycled Plastics":
——Part 1: General rules;
——Part 2: Polyethylene (PE) materials;
——Part 3: Polypropylene (PP) materials;
——Part 4: Polyolefin mixture materials;
——Part 5: Acrylonitrile-butadiene-styrene (ABS) materials;
——Part 6: Polystyrene(PS) and impact-resistant polystyrene(PS-I) materials;
——Part 7: Polycarbonate (PC) materials;
——Part 8: Polyamide (PA) materials;
——Part 9: Poly (ethylene terephthalate) (PET) materials.
——Part 10: Polybutylene terephtalate (PBT) materials;
——Part 11: Polyvinyl chloride (PVC) materials;
——Part 12: Polymethyl methacrylate (PMMA) materials.
This document is Part 7 of GB/T 40006. In this document, the characteristic properties of recycled PC plastics are specified according to the characteristics of PC materials. When defining these property requirements, both the standard requirements of native PC materials and the characteristics of recycled PC plastics materials are considered.
Plastics — Recycled plastics — Part 7: Polycarbonate (PC) materials
1 Scope
This document specifies the classification and designation, requirements, test methods, inspection rules, marking, packaging, transportation and storage of recycled PC plastics.
This document is applicable to recycled PC plastics granules made of waste polycarbonate plastics by screening, sorting, cleaning, melting extrusion and granulation, and other processes. The matrix of the recycled PC plastic is thermoplastic polyester containing carbonic acid and aromatic diphenol compounds specified in GB/T 35513.1, and the polyester may be homopolymer, copolymer or mixture of the two.
This document does not apply to recycled PC plastics from hazardous wastes such as medical wastes, pesticide packaging and radioactive wastes.
This document does not apply to mixed recycled plastics of polycarbonate and other resin materials.
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 1033.1 Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method liquid pyknometer method and titration method
GB/T 1040.1-2018 Plastics — Determination of tensile properties — Part 1: General principles
GB/T 1040.2 Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics
GB/T 1843-2008 Plastics — Determination of izod impact strength
GB/T 2035 Terms and definitions for plastics
GB/T 2547 Plastic resins — Sampling
GB/T 2918 Plastics — Standard atmospheres for conditioning and testing
GB/T 3682.1-2018 Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics — Part 1: Standard method
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9341 Plastics — Determination of flexural properties
GB/T 9345.1-2008 Plastics — Determination of ash — Part 1: General methods
GB/T 14190-2017 Testing methods of fiber grade polyester (PET) chip
GB/T 17037.1 Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1:General principles,and moulding of multipurpose and bar test specimens
GB/T 19466.2 Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition temperature
GB/T 30102 Plastics — Guidelines for recovery and recycling of plastics waste
GB/T 33352 General rules of screening application of restricted substances in electrical and electronic products — X-Ray fluorescence spectrometry
GB/T 35513.2-2017 Plastics ― Polycarbonate (PC) moulding and extrusion materials ― Part 2: Preparation of test specimens and determination of properties
GB/T 40006.1-2021 Plastics — Recycled plastics — Part 1: General rules
SH/T 1541.1 Plastics — Test method for appearance of granules — Part 1: Visual method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 40006.1-2021, GB/T 2035 and GB/T 30102 apply.
4 Classification and designation
The designation and classification of recycled PC plastics shall be carried out according to GB/T 40006.1-2021.
The characteristic properties of recycled PC plastics are melt mass-flow rate (MFR) and notched izod impact strength.
The melt mass-flow rate is measured according to GB/T 3682.1-2018, with the test condition of 300°C and the load of 1.2 kg. The melt mass-flow rate is divided into three intervals, each of which is represented by a numeric code, as shown in Table 1. If the melt mass-flow rate is close to the critical value of the interval, the supplier shall specify the interval to which it belongs.
Table 1 Melt mass-flow rate interval in character set 4
Number code Melt mass-flow rate
g/10min
1 ≤10
2 >10~35
3 >35
The notched izod impact strength is measured at 6.15 and is divided into five intervals, each of which is represented by a numeric code, as shown in Table 2. If the notched izod impact strength is near the critical value of the interval, the supplier shall indicate the interval to which it belongs.
Table 2 Notched izod impact strength interval in character set 4
Number code Notched izod impact strength
kJ/m2
1 ≤5
2 >5~30
3 >30~40
4 >40~50
5 >50
See Table 3 for designation rules.
Table 3 Rules for designation
National standard reference No. Characteristic project set
Character set 1 Character set 2 Character set 3 Character set 4 Character set 5
Optional Required Optional Optional Optional Optional
GB/T 40006.1 PC (REC)-B2-C-1 No M 1-5 No
Example: Recycled PC plastic from industrial product (1), which is in blue (B2) and in cylindrical (C) shape, has no filler and is used for injection molding (M), with the melt mass-flow rate (MFR 300/1.2kg) of 8 g/10min (1) and the notched izod impact strength of 63 kJ/m2 (5), is named:
GB/T 40006.1-PC (REC)-B2-C-1, M, 1-5 [simplified name: PC (REC)-B2-C-1]
5 Requirements
5.1 General requirements
The main material of recycled PC plastics shall be polycarbonate. There shall be no impurities and oil pollution. It shall be uniform in particle size and has no obvious color difference.
5.2 Characterization of the main material
5.2.1 Infrared spectroscopy
The typical infrared spectrum of polycarbonate is shown in Figure A.1 in Annex A. The spectrum of recycled PC plastics shall have the characteristic absorption peak of polycarbonate in Figure A.1.
5.2.2 Glass transition temperature
The glass transition temperature (Tg) of recycled PC plastics generally ranges from 136°C to 155°C.
5.3 Odor grade
It shall meet the requirements of 5.3 in GB/T 40006.1-2021.
5.4 Restricted substance content
5.4.1 Heavy metal
It shall meet the requirements of 5.4 in GB/T 40006.1-2021.
5.4.2 Polybrominated biphenyls and other organic compounds
The content requirements of polybrominated biphenyls and other organic compounds in recycled PC plastics shall meet the requirements of 5.4 in GB/T 40006.1-2021. See Table 4 for the requirements of total bromine content and total chlorine content.
Table 4 Total bromine content and total chlorine content of recycled PC plastics
Name of restricted substances Unit Premium grade Qualified
Total bromine content mg/kg ≤100 >100~1000
Total chlorine content mg/kg ≤100 >100~1000
5.4.3 Bisphenol A limit
The limit of bisphenol A of recycled PC plastic shall meet the needs of its related application fields.
5.5 Radioactive substances
It shall meet the requirements of 5.5 in GB/T 40006.1-2021.
5.6 Appearance and performance requirements
See Table 5 for the properties and performance requirements of recycled PC plastics.
Note: See Annex B for other properties or test items that may be used for recycled PC plastics.
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 Requirements
6 Test method
7 Inspection rules
8 Marking
9 Packaging, transportation and storage
Annex A (Informative) Typical infrared spectrum of polycarbonate
Annex B (Informative) Other properties of recycled PC plastics
Bibliography
