GB/T 13941-2015 English PDF

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GB/T 13941-2015: Diphenylmethane diisocyanate
Status: Valid

GB/T 13941: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 13941-2015	299	Add to Cart	3 days	Diphenylmethane diisocyanate	Valid
GB/T 13941-1992	319	Add to Cart	3 days	Diphenylmethane 4, 4-diisocyanate	Obsolete

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GB/T 15593   GB/T 12008.2   GB/T 12672   GB/T 32366   GB/T 40006.11   

Basic data

Standard ID: GB/T 13941-2015 (GB/T13941-2015)
Description (Translated English): Diphenylmethane diisocyanate
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G32
Classification of International Standard: 23.140
Word Count Estimation: 14,110
Date of Issue: 2015-12-31
Date of Implementation: 2016-06-01
Older Standard (superseded by this standard): GB/T 13941-1992
Quoted Standard: GB/T 605-2006; GB/T 6678; GB/T 6679; GB/T 6680; GB/T 7533; GB/T 12009.2
Regulation (derived from): State Standard Announcement 2015 No.43
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
Summary: This standard specifies the requirements, test methods, inspection rules and signs, packaging, transportation and storage of diphenylmethane diisocyanate (hereinafter referred to as MDI). This standard applies to the aniline by condensation, phosgenation, separation, distillation obtained MDI.

GB/T 13941-2015: Diphenylmethane diisocyanate

---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.
Diphenylmethane diisocyanate ICS 83.040 G32 National Standards of People's Republic of China Replace GB/T 13941-1992 Diphenylmethane diisocyanate 2015-12-31 released 2016-06-01 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. This standard replaces GB/T 13941-1992 "diphenylmethane 4,4'-diisocyanate", compared with GB/T 13941-1992 The changes are as follows. --- Standard name is modified to diphenylmethane diisocyanate; - increased classification (see Chapter 3); --- increased the requirements of the MDI-50 grade (see Chapter 4); --- Elimination of qualified products, first grade and superior products (1992 version 3.1); --- increase the appearance, 2,4'-MDI content, 4,4'-MDI content requirements (see Table 4 in Table 2); - the freezing point to the crystallization point (see Chapter 4, Table 2,.1992, version 3.1); --- MDI-100 Cyclohexane insolubles reduced to 0.2% (see Chapter 4, Table 2,.1992 Edition 3.1); The method for measuring the chromaticity is changed from GB/T 3143-1982 to GB/T 605-2006 (see 5.2,.1992, 4.1); The method for the determination of MDI content is changed from chemical titration to capillary gas chromatography (see Appendix A); The method for the determination of cyclohexane insolubles increases the membrane method (see Appendix C); --- MDI-100 deterioration test to type test items (see 6.2,.1992 edition 5.4); - extended shelf life of solid MDI-100 products (see 7.4,.1992 6.4); - Increased shelf life of liquid MDI-100 and MDI-50 (see 7.4). 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. Wanhua Chemical Group Co., Ltd. This standard participates in the drafting unit. Dawn Chemical Research and Design Institute Co., Ltd., Gansu Yinguang Silver Chemical Co., Ltd., Shandong Granville New Materials Co., Ltd., Zhejiang Huafeng New Materials Co., Ltd. The main drafters of this standard. Chen Yifeng, Kong Ruifang, Mao Zhihong, Zou Shuzhen, Xu Yefeng, Meng Zhu, Jin Meijin, Shi Shuhui. This standard was first released in December.1992, this time for the first revision. Diphenylmethane diisocyanate

1 Scope

This standard specifies the requirements of diphenylmethane diisocyanate (hereinafter referred to as MDI), test methods, inspection rules and signs, packaging, Transportation, storage and so on. This standard applies to aniline by condensation, phosgenation, separation, distillation of the MDI.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. Chemical reagents - General methods for the determination of chromaticity of GB/T 605-2006 General rules for sampling of chemical products GB/T General rules for sampling of solid chemical products GB/T General rules for sampling of liquid chemical products GB/T Method for determination of crystallization point of organic chemical products GB/T GB/T 12009.2 Aromatic isocyanates for the production of plastic polyurethanes - Part 2. Determination of hydrolyzed chlorine

3 classification

According to MDI products 4,4'-MDI content is divided into MDI-100, MDI-50 two grades, use in Table 1. Table 1 MDI product grades and uses Grade Key Indicator Use MDI-100 4,4'-MDI content ≥97.0% Widely used in microporous elastomers, thermoplastic elastomers, casting elastomers, artificial leather, Synthetic leather, adhesives, coatings, sealants and the like MDI-50 4,4'-MDI content of 44.5% to 49.0% Can be widely used in high resilience foam, semi-rigid foam and microporous elastomer production, but also extensive Used in the production of elastomers, adhesives, paints and sealants

4 requirements

MDI technical indicators should be consistent with the provisions in Table 2. ......

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