GB/T 32471-2016 English PDF

US$219.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 32471-2016: Plastics -- Determination of the isomer ratio in toluene diisocyanate for use in the production of polyurethanes
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 32471-2016	219	Add to Cart	3 days	Plastics -- Determination of the isomer ratio in toluene diisocyanate for use in the production of polyurethanes	Valid

Similar standards

GB/T 30102   GB/T 31402   GB/T 34691.1   GB/T 32473   GB/T 32472   

Basic data

Standard ID: GB/T 32471-2016 (GB/T32471-2016)
Description (Translated English): Plastics -- Determination of the isomer ratio in toluene diisocyanate for use in the production of polyurethanes
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G31
Classification of International Standard: 83.04
Word Count Estimation: 11,164
Date of Issue: 2016-02-24
Date of Implementation: 2016-09-01
Regulation (derived from): National Standard Announcement No
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 32471-2016: Plastics -- Determination of the isomer ratio in toluene diisocyanate for use in the production of polyurethanes

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Plastics - Determination of the isomer ratio in toluene diisocyanates for use in the production of polyurethanes ICS 83.040 G31 National Standards of People's Republic of China Plastic for the production of toluene diisocyanate Determination of heterogeneous ratio Plastics-Determinationoftheisomerratiointoluenedisocyanates foruse intheproduction ofpolyurethanes (ISO 15064..2010, Plastics-Aromaticisocyanates foruseinthe toluenedisocyanate, NEQ) 2016-02-24 released 2016-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. In this standard, the infrared spectroscopy method uses the re-drafting method. ISO 15064..2010 "Plastics for aromatic production of poly Acid ester-toluene diisocyanate isomer ratio ", and ISO 15064..2010 consistency degree is not equivalent. This standard is proposed by the China Petroleum and Chemical Industry Association. This standard is under the jurisdiction of the National Plastics Standardization Technical Committee Polyurethane Plastics Subcommittee (SAC/TC15/SC8). This standard is responsible for drafting units. Cangzhou Dahua Co., Ltd. This standard participates in the drafting unit. Shandong Nuowei Polyurethane Co., Ltd., Shandong a Novo New Materials Co., Ltd., Gansu silver poly Silver Chemical Co., Ltd., Zhejiang Huafeng New Material Co., Ltd., Anhui Sino-Italian Tape Co., Ltd., Dawn Chemical Research and Design Institute Limited liability company. The main drafters of this standard. Zhang Gen Shan, Yao Hongyan, Mao Zhihong, Sun Qingfeng, Xu Yefeng, Qin Yuchun, Zhang Yixin, Liu Xu, Song Changjiang. Plastic for the production of toluene diisocyanate Determination of heterogeneous ratio IMPORTANT NOTE. TDI is absorbed by the skin through the skin or inhaled steam. The test procedure should provide adequate ventilation and wear rubber or plastic Gloves and other protective measures.

1 Scope

This standard specifies the method of infrared spectroscopy and gas chromatography for the determination of isomers in toluene diisocyanate. This standard applies to two mixtures of toluene-2,4-diisocyanate (2,4-TDI), toluene-2,6-diisocyanate (2,6-TDI) Determination of isomer ratio. Test method A for infrared spectroscopy is suitable for the determination of 5% to 95% 2,6-TDI (95% to 5% 2,4- TDI); Test Method B is suitable for the determination of samples containing 0% to 5% 2,6-TDI (100% to 95% 2,4-TDI).

2 infrared spectroscopy

2.1 Principles This method is based on the non-horizontal distortion (carbon) of the CH bond on the benzene ring at 810 cm-1 and 782 cm-1 of 2,4-TDI and 2,6-TDI Hydrogen bond) caused by the quantitative absorption of infrared light, the two infrared characteristic wavelength light absorption intensity ratio, the preparation of the standard song Line to determine the mass ratio of 2,4-TDI and 2,6-TDI to obtain the isomer ratio of the sample. 2.2 Test Precautions Because TDI is easy to react with moisture in the air, special attention should be paid to sample preparation. The usual sampling method (for example, in an open container Even if the sampling speed is very fast, can also cause the sample to produce insoluble urea, so always use dry inert gas (such as nitrogen, argon) A closed sampler may be used on the production line or on conditions permitting. 2.3 Reagents This method uses the following reagents. a) cyclohexane. analytical grade, before use with 4A molecular sieve to remove water for more than 24 hours; b) 2,4-TDI. reference reagent, crystallization point 22.0 ° C, refractive index (n20D) 1.56781, density (20 ° C) 1.2186 g/cm 3; c) 2,6-TDI. Reference reagent, crystallization point 18.2 ° C, refractive index (n20D) 1.57111, density (20 ° C) 1.2270 g/cm 3. Determination 80/20-TDI isomerization, the 2,6-TDI reference can be replaced with a 65/35-TDI high purity reagent (crystallization point 8.0 ° C) d) nitrogen. dew point below -60 ° C. Note. As the isocyanate easily react with moisture, and exposed to the air easily yellow, it is generally filled with nitrogen (dew point ≤ -60 ℃) sealed storage. 2.4 Instruments This method uses the following instruments. a) Infrared spectrophotometer. Fourier infrared spectrophotometer, the accuracy of 0.2%; b) liquid infrared absorption cell. 1) Test Method A. 0.2 mm sodium chloride or potassium bromide window liquid liquid infrared absorption cell; 2) Test method B. 0.1 mm sodium chloride or potassium bromide window liquid liquid infrared absorption cell. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 32471-2016_English be delivered?

Answer: Upon your order, we will start to translate GB/T 32471-2016_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 32471-2016_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 32471-2016_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.