Method for analyzing absolute content of polysulfide silane coupling agent monomer

Abstract

The invention discloses a method for analyzing the absolute content of a polysulfide silane coupling agent monomer. The analysis method comprises the steps of testing a polysulfide silane coupling agent by adopting a gas chromatography internal standard method and a nuclear magnetic resonance silicon spectrum method; and correcting the data of the nuclear magnetic resonance silicon spectrum methodby using the data of the gas chromatography internal standard method to obtain the absolute content of the total monomer of the polysulfide silane coupling agent. The method disclosed by the invention is suitable for a detection method required by daily production monitoring, is simple and convenient to operate, low in detection cost and easy to popularize and apply, can truly feed back the effective content of the monomer in the polysulfide silane coupling agent product, and solves the problem of an analysis method which puzzles polysulfide silane coupling agent production enterprises and users for a long time at present.

Description

technical field [0001] The invention relates to an analysis method for the absolute content of a polysulfide silane coupling agent monomer, which belongs to the technical field of chemical industry. Background technique [0002] Polysulfide silane coupling agent, the general formula is [(RO) n R' 3-n SiC m h 2m ] 2 S x , wherein, x=2~10, it has a hydrolyzable group, which is easily hydrolyzed to produce Si-OH, and then undergoes condensation reaction with inorganic substances to form Si-O-Si chemical bonds or hydrogen bonds (covalent bonds). It can build a bridge between chemical bonds or covalent bonds, thus acting as a coupling agent. [0003] Because the polysulfide silane coupling agent has easily hydrolyzed groups, it will inevitably encounter water or humid air during its raw material source, production and storage process, resulting in the hydrolysis of the hydrolyzable groups to form Si- Monomers with OH groups, monomers containing Si-OH groups have a tendency...

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Problems solved by technology

[0005] Consider simultaneously the volatile impurity content in the polysulfide silane coupling agent, polymer content, the effective content of the component polysulfide silane coupling agent monomer expected in the polysulfide silane coupling agent product (hereinafter referred to as the absolute content ) analysis method has not been published

[0006] At present, although the relative content of monomers and polymers in silane coupling agents can be tested by the method of silicon nuclear magnetic resonance spectroscopy, general enterprises are not equipped with nuclear magnetic resonance instruments. In addition to the complicated and cumbersome daily maintenance of nuclear magnetic resonance instruments, the main reason is It is expensive, has high requirements for the equipment environment, high maintenance costs, and high testing costs, and has high requirements for the professional knowledge and skills of operators, which is not suitable for the daily production and testing needs of enterprises.

Moreover, this test method obtains the relative content of the monomer, not the absolute content, and cannot fully feedback the quality of the polysulfide silane coupling agent.

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