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ASTM D5606-2019 甲苯二异氰酸酯原料用甲苯的规格 Standard Specification for Toluene for Toluene Diisocyanate (TDI) Feedstock
<div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.1</span> This specification covers toluene for toluene diisocyanate (TDI) feedstock.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.2</span> The following applies to all specified limits in this specification: for purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice <span class="Body-link1 cdone">E29</span>.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.3</span> Consult OSHA regulations and supplier’s Safety Data Sheets for all materials used in this specification.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.4</span> The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.</p></div> <div class="SectionLevel2"> <p class="WTOcaveat cdone2"><span class="Head3 cdone">1.5</span> <i>This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.</i></p></div>...
2023-08-26 09:24:02浏览：26
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HS/T 26-2017 甲苯二异氰酸酯中同分异构体含量的测定 气相色谱法 Determination of isomers of toluene diisocyanate in proportion -gas-chromatography
本标准规定了2,4-甲笨二异氰酸酯(2,4-TDI）和2,6一甲苯二异氰酸酯(2,6-TDI)两种同分异构体混合物含量比例的气相色谱测定方法。<br />本标准适用于2,4-甲苯二异氰酸酯和2.6-甲苯二异氰酸酯混合物的含量比例分析。...
2023-08-18 01:12:01浏览：45
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ASTM D4660-2018 聚氨酯测试方法：甲苯二异氰酸酯含量测定 Standard Test Methods for Polyurethane Raw Materials:Determination of the Isomer Content of Toluenediisocyanate
1.1 These test methods measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene–2,4–diisocyanate (2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of toluenediisocyanate (TDI). Two different test methods are provided to give accurate results over the broad range of isomer concentrations possible. 1.1.1 Test Method A—Applicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer). 1.1.2 Test Method B—Applicable to TDI samples containing 0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer). Note 1: These test methods are equivalent to ISO 15064. 1.2 The values stated in SI units are to be regarded as standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee....
2023-08-01 07:36:01浏览：24
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聚乙二醇PU弹性体的研制
探讨以聚乙二醇(PEG)和甲苯二异氰酸酯(TDI)为主要原料合成PU弹性体的优化条件.结果表明,采用相对分子质量较小的PEG-400(相对分子质量400)、TDI/PEG-400摩尔比为1/1.05合成的PU弹性体硬度适中,玻璃化温度较低;以该条件制备的浇注型PU弹性体纺织胶辊性能满足使用要求....
2020-06-12 15:04:33浏览：1448
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聚乙二醇PU弹性体的研制
探讨以聚乙二醇(PEG)和甲苯二异氰酸酯(TDI)为主要原料合成PU弹性体的优化条件.结果表明,采用相对分子质量较小的PEG-400(相对分子质量400)、TDI/PEG-400摩尔比为1/1.05合成的PU弹性体硬度适中,玻璃化温度较低;以该条件制备的浇注型PU弹性体纺织胶辊性能满足使用要求....
2020-03-23 18:32:32浏览：1429
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