Method for synthesizing p-phenylene diisocyanate

A technology for the synthesis of p-phenylene diisocyanate, which is applied in the preparation of isocyanic acid derivatives, chemical instruments and methods, and the preparation of organic compounds. It can solve problems such as harsh reaction conditions, complicated processes, and pollution, and achieve short reaction times. , The synthesis process is simple, the operation is simple and safe
CN1687022AInactive Publication Date: 2005-10-26杭州崇舜化学有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
杭州崇舜化学有限公司
Publication Date
2005-10-26
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The present invention relates to a method for synthesizing p-phenylene diisocyanate. Said method includes the following steps: adding inert organic solution of di(trichloromethyl) carbonate into reaction flask, introducing nitrogen gas to make protection, under the condition of cooling slowly adding inert organic solution of p-phenylene diamine, making reaction for 2-4 hr, at 15-200 deg.C and 0-0.3 MPa, after the reaction is completed, removing solvent, filtering and washing so as to obtain solid product p-phenylene diisocyanate.
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Description

technical field

[0001] The invention belongs to a synthesis method of p-phenylene diisocyanate, in particular to a method for synthesizing p-phenylene diisocyanate in one step by reacting p-phenylene diamine with bis(trichloromethyl)carbonate. Background technique

[0002] Polyurethane elastomer has been widely used in various fields of social life due to its high strength, good toughness, wear resistance, oil resistance and solvent resistance. The important structural factor affecting the performance of polyurethane is the diisocyanate in the hard segment. The better its rigidity, regularity, and symmetry, the greater the cohesive energy of the elastomer, the higher the phase separation, and the better the performance. P-phenylene diisocyanate is a typical symmetrical diisocyanate with molecular structure. It reacts with chain extenders such as diols or diamines to form dense polyurethane hard segments with high cohesive energy, so it has a good phase Separation, the perfo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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