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Aliphatic diisocyanate and preparation method and purposes thereof

A diisocyanate and aliphatic technology, which is applied in the field of C21-36 aliphatic diisocyanate and its preparation, can solve the problems of easy occurrence of side reactions, harsh process conditions, inconvenient post-processing, etc., and achieves the advantages of industrial popularization and application and product yield. High, less side effects

Active Publication Date: 2010-08-18
浙江优创材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for continuous or discontinuous steps during which different types of chemicals are added together without causing any harmful substances like amines that could damage equipment. It offers various applications including making paints, coating materials, rubbers, plasterboards, etc., while still being environmentally friendly due to its unique molecular structures.

Problems solved by technology

This technical problem addressed in this patented text relates to finding an efficient way for producing specific types of compounds called diphenoxy propanes that can be applied on various surfaces like paints and adherents without causing harmful effects during production processes.

Method used

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  • Aliphatic diisocyanate and preparation method and purposes thereof
  • Aliphatic diisocyanate and preparation method and purposes thereof
  • Aliphatic diisocyanate and preparation method and purposes thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Preparation C 21 Aliphatic diisocyanate

[0062] step 1:

[0063] Add 500g (1.7mol) methyl oleate, 123.5g (1.7mol) methyl acrylate and 1.5g hydroquinone to a 2000mL pressure reactor, replace the air in the kettle with nitrogen, heat up to 160-180°C, and react After 3.5 hours, the crude dibasic acid ester was obtained. The resulting product is a mixture of the following dibasic esters, and its structural formula is:

[0064]

[0065] Lower the temperature and pump the reaction mixture into another 2-liter autoclave, then add 500g methanol and 30gPd (5%) / activated carbon catalyst (wet: dry weight 15g, 0.75g Pd), vacuumize, nitrogen replacement, hydrogen replacement . The reaction mixture was stirred at 160-170° C., 1.5-2.0 Mp for about 7.5 hours, until the hydrogen absorption was complete, and the stirring was stopped. The material was filtered off under nitrogen pressure, leaving the catalyst in the filter. With 500g methanol, the catalyst is backwash...

Embodiment 2

[0078] Example 2: C 22 Aliphatic diisocyanate

[0079] step 1:

[0080] Add 500g (1.7mol) methyl oleate, 171.7g (1.7mol) α-methyl methacrylate and 1.5g hydroquinone to a 2000mL pressure reactor, replace the air in the kettle with nitrogen, and heat up to 120~ 140°C, reacted for 3.5 hours to obtain crude dibasic acid. The resulting product is a mixture of the following dibasic esters, and its structural formula is:

[0081]

[0082] Lower the temperature and pump the reaction mixture into another 2-liter autoclave, then add 500g ethanol and 30gPt (5%) / activated carbon catalyst (wet: dry weight 15g, 0.75g Pd), vacuumize, nitrogen replacement, hydrogen replacement . The reaction mixture was stirred at 150-180° C., 2.0-2.5 Mp for about 8 hours, until the hydrogen absorption was complete, and the stirring was stopped. The material was filtered off under nitrogen pressure, leaving the catalyst in the filter. With 500g of ethanol, the catalyst is backwashed into the reactor,...

Embodiment 3

[0095] Example 3: C 22 Aliphatic diisocyanate

[0096] step 1:

[0097] Add 500g (1.7mol) methyl oleate, 171.7g (1.7mol) β-methyl methacrylate (methyl crotonate) and 1.5g hydroquinone to a 2000mL pressure reactor, and replace the air in the kettle with nitrogen , heated to 160-180°C, and reacted for 3.5 hours to obtain crude dibasic acid. The resulting product is a mixture of the following dibasic esters, and its structural formula is:

[0098]

[0099] Lower the temperature and pump the reaction mixture into another 2-liter autoclave, then add 500g methanol and 30gPd (5%) / activated carbon catalyst (wet: dry weight 15g, 0.75g Pd), vacuumize, nitrogen replacement, hydrogen replacement . The reaction mixture was stirred at 160-170° C., 1.5-2.0 Mp for about 7.5 hours, until the hydrogen absorption was complete, and the stirring was stopped. The material was filtered off under nitrogen pressure, leaving the catalyst in the filter. With 500g methanol, the catalyst is backw...

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Abstract

The invention provides a type of aliphatic diisocyanate with a novel chemical structure, which is C21-36 aliphatic diisocyanate, has the same excellent performance with other traditional aliphatic isocyanates, and is used for preparing polyurethane varnish, coating, elastomer, adhesive, textile finishing agent, rocket propellant and the like. The invention also provides a preparation method of this type of substance, which comprises the following steps that: (a) unsaturated dicarboxylic acid with a special structure or the ester solution thereof are catalyzed and hydrogenised to prepare saturated diacid; (b) the saturated diacid is dissolved into inert solvent and added with chloride agent to react and prepare binary acid chloride; (c) sodium azide is added in to react and prepare the corresponding azide; and (d) the azide is isomerized and decomposed to prepare an aliphatic diisocyanate crude product. The method is characterized by lower condition requirements, safety, environmental-friendliness, fewer side effects, high yield and easy wide popularization in industry.

Description

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Claims

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Application Information

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Owner 浙江优创材料科技股份有限公司
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