Method of stabilizing activity of monomer isocyanate

An isocyanate and diisocyanate technology is applied in the field of stabilizing the reactivity of monomeric isocyanates, which can solve the problems of uncontrollable molecular structure of polyurethane products, increased process adjustment complexity, and inability to reduce content, and achieves effective stabilization of activity, convenient and reliable preparation, and reaction. smooth effect

Active Publication Date: 2021-02-02
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the treatment measures for amines, phosgene, and acid value reduction for the reaction process, phosgene removal, and solvent removal processes have limitations, and it is usually impossible to reduce the content of hydrolyzed chlorine and acidic substances in isocyanates to less than 10ppm
[0012] In the downstream application of monomeric isocyanate, when the fluctuation range of acid value is greater than 2ppm, the reaction rate will be significantly affected, which will lead to uncontrollable molecular structure of polyurethane products and increase the complexity of process adjustment.

Method used

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  • Method of stabilizing activity of monomer isocyanate
  • Method of stabilizing activity of monomer isocyanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a) Component hindered amine selection (Switzerland Ciba, Tinuvin 770), compounded with epoxidized soybean oil (Longda oil, Z-10L) to obtain additive I, wherein the mass fractions of hindered amine and epoxidized soybean oil are 10% and 90% respectively. Select the monomeric isocyanate B with an acid value of 20ppm, add the above-mentioned additive I at a mass fraction of the monomeric isocyanate of 0.01%, and obtain a monomeric isocyanate sample B' with stable activity, and test the activity of B and B' according to the above-mentioned standard sample activity test method . The results are shown in the table below.

[0036] Numbering monomeric isocyanate thermometer reading 1 Sample A 53.5℃ 2 Sample B 47.6℃ 3 Sample B' 53.1℃

[0037] It can be seen that Additive I can stabilize the activity of monomeric isocyanate with an acid value of 20 ppm to the level of monomeric isocyanate with an acid value of 1 ppm.

Embodiment 2

[0039] a) Component hindered amine selection (Shanxi Research Institute of Chemical Industry, GW 508), compounded with epoxidized soybean oil (Yancheng Shuanghong Chemical, ESO) to obtain Additive II, wherein the mass fractions of hindered amine and epoxidized soybean oil are 50% and 50%, respectively. Select the monomeric isocyanate C with an acid value of 12ppm, add the above-mentioned additive II according to the mass fraction of the monomeric isocyanate at 1%, and obtain the monomeric isocyanate sample C' with stable activity, and test the activity of C and C' according to the above-mentioned standard sample activity test method . The results are shown in the table below.

[0040] Numbering monomeric isocyanate thermometer reading 1 Sample A 53.5℃ 2 Sample C 48.3℃ 3 Sample C' 53.3℃

[0041] It can be seen that Additive II can stabilize the activity of the monomeric isocyanate with an acid value of 12 ppm to the level of a monomeric ...

Embodiment 3

[0043] a) Component hindered amine selection (Switzerland Ciba, Tinuvin 123), compounded with epoxidized soybean oil (Aladdin's reagent) to obtain additive III, wherein the mass fractions of hindered amine and epoxidized soybean oil are 20% and 80% respectively. Select the monomeric isocyanate D with an acid value of 16ppm, add the above-mentioned additive III according to the mass fraction of the monomeric isocyanate at 0.5%, to obtain a monomeric isocyanate sample D' with stable activity, and test the activity of D and D' according to the above-mentioned standard sample activity test method . The results are shown in the table below.

[0044] Numbering monomeric isocyanate thermometer reading 1 Sample A 53.5℃ 2 Sample D 47.9℃ 3 Sample D' 53.6℃

[0045] It can be seen that Additive III can stabilize the activity of the monomeric isocyanate with an acid value of 16 ppm to the level of a monomeric isocyanate with an acid value of 1 ppm. ...

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Abstract

The present invention provides a method of stabilizing the activity of monomer isocyanate, which comprises the step of adding to the monomer isocyanate an effective amount of (a) a hindered amine and(b) epoxidized soybean oil. The hindered amine includes at least one of the compounds as shown in a formula (I) (see the specification), wherein n is an integer of 1-10, and R1 and R2 are hydrogen, aC1-C4 alkyl group or a C2-C8 alkanoyl group. The additives disclosed by the invention can be well dissolved in monomer isocyanate and stabilize hydrolyzed chlorine and acidic substances, thereby beingbeneficial to reducing the activity fluctuation of the monomer isocyanate.

Description

technical field [0001] The invention relates to the field of isocyanates, in particular to a method for stabilizing the reactivity of monomeric isocyanates. Background technique [0002] Monomeric isocyanate can be used in the production of polyurethane microcellular elastomers, synthetic leather pulp, thermoplastic polyurethane elastomers, cast polyurethane elastomers and polyurethane elastic fibers. Generally, monomeric isocyanate and difunctional polyols such as polyester polyol and polyether polyol are polymerized first, and a prepolymer containing -NCO group is obtained under the condition of ensuring excess monomeric isocyanate. The body reacts with the small molecule diol or small molecule diamine as a chain extender to extend the molecular chain and obtain the polymer with the required molecular weight; in addition, in some processes, the monomeric isocyanate, macromolecular polyol and Small molecule chain extenders react synchronously to obtain polymers with design...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/18C07C265/14C08G18/76C08G18/48D01F6/78
CPCC07C263/18C08G18/7671C08G18/4854D01F6/78C07C265/14
Inventor 高振华张坤彭华庆齐旺顺张宏科
Owner WANHUA CHEM GRP CO LTD
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