Some standard content:
Chemical Industry Standard of the People's Republic of China
Specifications of Polyester Polyols
Subject Content and Scope of Application
HG/T 2707-95
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation, storage and other requirements for ester polyols. This standard applies to ester polyols prepared by condensation reaction of adipic acid and low molecular weight polyols. 2 Reference Standards
GB/T605 General Method for Colorimetric Determination of Chemical Reagents GB/T6678 General Rules for Sampling of Chemical Products
GB/T6680 General Rules for Sampling of Liquid Chemical Products GB/T12008.6 Determination of Water Content in Polyether Polyols HG/T2706 Nomenclature of Polyester Polyols
Determination of Acid Value in Polyester Polyols
HG/T2708
: Determination of Hydroxyl Value in Ester Polyols
HG/T 2709
Product models and main uses
Polyester polyols are named according to the naming method specified in HG/T2706'. This standard includes 6 models. The models and main uses of polyester polyols applicable to this standard are shown in Table 1. Table 1 Models and main uses
12056E
30112C
30196C
16075E
13056E
16056E
Technical requirements
The physical and chemical properties of each model of polyester polyols shall comply with the requirements of Table 2. Approved by the Ministry of Chemical Industry of the People's Republic of China on May 5, 1995. Main raw materials for polyurethane synthetic leather and elastomers. Main raw materials for polyurethane resins for coating. Main raw materials for polyurethane resins for coating. Main raw materials for elastomers and urethane resins for soles. Main raw materials for elastomers and hydrophilic ester resins for soles. Main raw materials for polyurethane for soles and coatings. Implementation on January 1, 1996. 12056E. 30112C. 30196C. [6075E. 13056E.
16056E
5 Test methods
Superior products
First-class products
Qualified products
Superior products
First-class products
Qualified products
Superior products
First-class products
Qualified products
Superior products
First-class products
Qualified products
Superior products
First-class products
Qualified products
5.1 Preparation of samples
mg KoH/g
53. 5~58. 5
53. 0 ~ 59. 0
[06~118
185~205
HG/T2707—95
0. 1~ 0. 8
0. 1~ 1. 0
0. 1 ~0. 8
0. 1 ~ 0. 7
Chroma (Pt-St)
Place the solid polyol sample bottle in an oven and completely melt the sample at 70-80°C. 5.2 Determination of hydroxyl value
The method specified in HG/T2709 shall be used for determination. 5.3 Determination of acid value
The method specified in HG/T2708 shall be used for determination. 5.4 Determination of moisture
The method specified in GB/T12008.6 shall be used for determination. 5.5 Determination of chromaticitywwW.bzxz.Net
Reaction index
230±15
HG /T 2707 -- 95
Measured by the method specified in GB/T605, 5. 6 Determination of reaction index
Measured by the method specified in Appendix A, 6 Inspection rules
6.1 Each batch of lipophilic polyol products is a batch of 62 sampling units according to the provisions of Table 2 in GB/T6678, the sampling unit is calculated by the packaging barrel, the sampling method is carried out according to the method specified in GB/T6680, and the sampling volume is not less than 1k. Solid polyester polyol is sampled after melting, the melting temperature is 70~80, 6.3 Mix the sample carefully and pack it into two clean and dry glass ground-mouth bottles and seal them. A label is affixed to the bottle, indicating the manufacturer's name, product name, batch number, sampling date and name of the sampler. One bottle is used for inspection and one bottle is kept for three months for future reference. 6.4 Each batch of products must be inspected by the quality inspection department of the manufacturer. The manufacturer should ensure that all products leaving the factory meet the requirements of this standard. Each batch of products shall be accompanied by a quality inspection report. (5) The hydroxyl value, acid value, moisture, chromaticity and reaction index in Table 2 of Article 4 of this standard are all factory inspection items. 6.6 If the user unit needs to inspect the received products, it shall be carried out in accordance with the provisions of this standard. The inspection shall be carried out within two months of receiving the product.
67 If a certain inspection result does not meet the requirements of this standard, the batch of products shall be resampled with twice the number of sampling units, and the unqualified items shall be retested, and the grade shall be determined by the retest results. 6.8 When the supply and demand parties have objections to the product quality, the two parties shall negotiate to resolve the dispute, or ask the statutory quality supervision and inspection department to arbitrate. 7 Marking, packaging, transportation and storage
7.1 Marking
The surface of the packaging container of mulberry aldehyde polyol shall have Clear and firm markings shall be marked with the product name, trademark, model, net weight, manufacturer's name, moisture-proof mark and this standard number.
7.2 Packaging
This product is packaged in a clean and dry 200L galvanized iron barrel. The barrel cover is strictly sealed and has an outer cover. Each package shall be accompanied by a quality certificate indicating the batch number, grade and production date. 7.3 Transportation
This product shall be strictly prevented from being dripped and contaminated during transportation. Handle it with care. This product is a non-dangerous product.
7.4 Storage
The product shall be stored at room temperature in a ventilated and dry warehouse. The storage period of this product is six months from the date of production. If the storage period exceeds the storage period, it can be inspected according to the provisions of this standard. If it meets the quality requirements, it can continue to be used. A 1 Method Summary
HG/T 2707-95
Appendix A
Determination of Reaction Index
(Supplement)
After MDI is added to the polyol for 10 minutes, the time taken for the reaction viscosity to increase to 2000 Pa·s is calculated from this time.
A2 Instruments and Reagents
A2.1 Rotational viscometer,
A2.2 Constant temperature oil bath, 80±0.2℃, 2A2.3 Four-necked flask, 500mL,
A2.4 Glass cup, diameter about 45mm, height about 155mm.A2. 5 Glass thermometer, 0~150c, graduation value 0.1℃, A2.6
Beaker, 50mL,
A2.7 Pharmaceutical balance, volume 0.1g.
A2.8 Pharmaceutical balance, sense 0.5g.
A2.9 Electric stirrer, 100r/min,
Ammonia, flow rate 10 mL/min.
Dimethylamide, moisture content not more than 0.03%
A3 Analysis steps
A3.1 Reaction device of polyester polyol and MDI as shown in Figure A1 Figure Al
1 Oil bath; 2-Glass hygrometer: 3-Electric stirrer: 4N, inlet pipe; 5-N, outlet pipe: 6-Lemon peel stopper; 7-Four-necked flask HG/ T 2707 —95
A3.2 Weigh a polyester polyol sample with a sample size of 0.1×56 100 × 2
hydroxyl value + acid value
(finely crushed to 0.5), and place it in a four-necked flask
. Then weigh 10% of the mass of the polyester polyol, diisocyanate (accurate to 0.1g), and add it into the four-necked flask. A3.3 Place the four-mouth flask in a lubricating bath at 80±2℃, and let ammonia flow into the flask at a flow rate of about 10L./m3. A3.4 When the temperature in the flask reaches 80℃, place the beaker on a pan balance, weigh 26.5g of molten MD1 preheated to 80℃ and place it in the flask, and start the stirrer to react for 10 minutes under stirring. A3.5 Quickly transfer the sample in the flask to a glass cup preheated to 80±2℃ in another oil bath, and continue to keep the temperature of the glass cup at 80±2℃.
A3.6 Within 1 hour after the sample is transferred to the glass cup, measure the viscosity of the solution in the glass cup every 10min, and within the next 2 hours, measure the viscosity every 20min until the viscosity reaches 2000Pa*s.A4 Expression of analysis results
Use semi-logarithmic coordinate paper to represent viscosity on the vertical axis and reaction time on the horizontal axis, draw a graph, and find out the time when the viscosity reaches 2000Pa·8 from the graph, min.
A5 Test report
The test report should include the following items:
The batch number of the polyol used;
The batch number of MDI used:
The maximum reaction temperature:
The time taken for the viscosity to reach 2000Pa·8. Additional notes:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Plastic Resin Products Branch of the National Plastic Standardization Technical Committee (TC15/SC4). This standard was drafted by Yantai Heqie General Factory. The main drafters of this standard are Shan Qing, Wang Xiuying, Deng Bingqiao, Chen Shuangfei, and Li Shanjun.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.