Grease-based polyamine curing agent as well as preparation method and application thereof

A technology of curing agent and grease, which is applied in the field of polyurethane, can solve the problems of weak chemical stability and poor weather resistance, and achieve the effects of stable space structure, enhanced weather resistance, and increased toughness and strength

Active Publication Date: 2021-05-07
SUZHOU FENGBEI BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, attempts have been made to use renewable resources to make non-isocyanate polyurethane, such as vegetable oil-based polyurethane, but the current vegetable oil-based polyurethane has the disadvantages of poor weather resistance and weak chemical stability, and is not suitable for use as a rigid foam polyurethane component

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example provides a kind of preparation method of grease-based polyamine solidifying agent, and described preparation method comprises the steps:

[0042] (1) Weigh 400g of castor oil in the reaction kettle, add 24g of formic acid and 1.2g of concentrated sulfuric acid, stir evenly and heat up to 50°C, then add 300g of hydrogen peroxide dropwise at a constant speed, the time to complete the dropwise addition is 2h, and continue the constant temperature reaction for 2.5h, Afterwards, through steps such as separation, alkali washing, water washing, and vacuum distillation, the epoxy castor oil with an epoxy value of 4.5% is obtained;

[0043] (2) the epoxy castor oil and adipic acid that step (1) obtains are in toluene system, generate epoxy castor oil base dibasic acid monoester under the catalysis of methanesulfonic acid, epoxy castor oil and dibasic acid mole The ratio is 1.2:3, the amount of p-toluenesulfonic acid added accounts for 1% of the epoxy castor oil, the...

Embodiment 2

[0046] This example provides a kind of preparation method of grease-based polyamine solidifying agent, and described preparation method comprises the steps:

[0047] (1) Weigh 400g of castor oil in the reaction kettle, add 24g of formic acid and 1.2g of concentrated sulfuric acid, stir evenly and heat up to 50°C, then add 300g of hydrogen peroxide dropwise at a constant speed, the time to complete the dropwise addition is 2h, and continue the constant temperature reaction for 2.5h, Afterwards, through steps such as separation, alkali washing, water washing, and vacuum distillation, the epoxy castor oil with an epoxy value of 4.5% is obtained;

[0048] (2) the epoxy castor oil and sebacic acid that step (1) obtains are in toluene system, generate epoxy castor oil base dibasic acid monoester under the catalysis of p-toluenesulfonic acid, epoxy castor oil and dibasic acid mole The ratio is 1:3, the amount of sulfonic acid added accounts for 1% of the epoxy castor oil, the reactio...

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Abstract

The invention discloses a grease-based polyamine curing agent and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing castor oil, hydrogen peroxide, formic acid and concentrated sulfuric acid and / or p-toluenesulfonic acid for reaction to generate epoxy castor oil; (2) enabling the epoxy castor oil obtained in the step (1) and fatty acid group dibasic acid to generate epoxy castor oil based dibasic acid monoester in an organic solvent under the catalysis of p-toluenesulfonic acid; (3) reacting the epoxy castor oil-based dibasic acid monoester obtained in the step (2) with polyethylene polyamine to generate a grease-based polyamine curing agent. The invention also discloses polyurethane of which the raw materials comprise the grease-based polyamine curing agent. The grease-based polyamine curing agent prepared by the method can be used as a curing agent to react with cyclic carbonate, the spatial structure of polyurethane formed after polymerization is more stable due to the multi-branched chain structure in molecules, the prepared vegetable oil-based polyurethane is endowed with excellent toughness and strength, and meanwhile, the weather resistance and the chemical stability are enhanced.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular relates to vegetable oil-based polyurethane, in particular to a grease-based polyamine curing agent and its preparation method and application. Background technique [0002] Traditional polyurethane is mainly a polymer compound containing repeated carbamate groups in the main chain formed by the addition polymerization of diisocyanate or polyisocyanate and polyhydroxy compounds. Because of its good solvent resistance and abrasion resistance, as well as its outstanding properties such as high strength and elasticity, it is widely used in rubber, coatings, plastics, adhesives and other fields. However, isocyanate, the main material used in the preparation of polyurethane, is highly toxic and harmful to human health, and the synthesis route of isocyanate is also highly dangerous and difficult to operate. Today's chemical industry not only requires products with excellent comprehe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/42C07D301/00C07D301/12C08G18/36C08G18/32
CPCC07D303/42C07D301/00C07D301/12C08G18/36C08G18/3825
Inventor 任鹏李寅平原马敏
Owner SUZHOU FENGBEI BIOTECH CO LTD
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