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Isocyanate prepolymer as well as preparation method and application thereof

An isocyanate prepolymerization and isocyanate technology, which is applied in the field of polymer materials, can solve the problems of inability to introduce polyurethane, uneven distribution of Si-OR groups, reducing the improvement effect of mechanical properties of polyurethane materials, etc. The effect of improving compatibility

Inactive Publication Date: 2019-07-12
YJ企业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the polyurethane obtained by the capping modification of the isocyanate prepolymer in the prior art and cannot introduce an effective amount of Si-OR groups, and the distribution of Si-OR groups is uneven, reducing Defects in improving the mechanical properties of polyurethane materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a kind of polyurethane prepolymer, and synthetic raw material comprises TDI-80 (TDI-80 is toluene-2,4-diisocyanate that mass fraction is 80%, and toluene-2,6-diisocyanate that mass fraction is 20% Diisocyanate composition) 100g and γ-aminopropyltriethoxysilane 1.27g. The preparation method of polyurethane prepolymer comprises the following steps:

[0030] (1) Add 100g of TDI-80 into a four-necked flask with a built-in stirring device, bathe in water, and keep the temperature in the flask at 40°C;

[0031] (2) Add 1.27 g of γ-aminopropyltriethoxysilane dropwise into the flask, and control the dropping time to 4 hours. During the dropwise addition, control the temperature in the flask to 40°C. If the temperature exceeds 40°C during the reaction, stop the dropwise addition, and continue the dropwise addition after the temperature drops;

[0032] (3) After the dropwise addition, when the NCO value of the reaction system in the test flask reaches 4...

Embodiment 2

[0034] This embodiment provides a polyurethane prepolymer, and the synthesis raw materials include 100 g of TDI-80 and 2.54 g of γ-aminopropyltriethoxysilane. The preparation method of polyurethane prepolymer comprises the following steps:

[0035] (1) Add 100g of TDI-80 into a four-necked flask with a built-in stirring device, bathe in water, and keep the temperature in the flask at 40°C;

[0036] (2) Add 2.54 g of γ-aminopropyltriethoxysilane dropwise into the flask, and control the dropping time to 2 hours. During the dropwise addition, control the temperature in the flask to 40°C. If the temperature exceeds 40°C during the reaction, stop the dropwise addition, and continue the dropwise addition after the temperature drops;

[0037] (3) After the dropwise addition, when the NCO value of the reaction system in the test flask reaches 46%, the reaction is stopped and the material is discharged to obtain an isocyanate prepolymer.

Embodiment 3

[0039] This embodiment provides a polyurethane prepolymer, and the synthesis raw materials include 100 g of TDI-80 and 12.7 g of γ-aminopropyltriethoxysilane. The preparation method of polyurethane prepolymer comprises the following steps:

[0040] (1) Add 100g of TDI-80 into a four-neck flask with a built-in stirring device, bathe in ice water, and keep the temperature in the flask at 20°C;

[0041] (2) Add 12.7 g of γ-aminopropyltriethoxysilane dropwise into the flask, and control the dropping time to be 8 hours. During the dropwise addition, control the temperature in the flask to 20°C. If the temperature exceeds 20°C during the reaction, stop the dropwise addition, and continue the dropwise addition after the temperature drops;

[0042] (3) After the dropwise addition, when the NCO value of the reaction system in the test flask reaches 38%, the reaction is stopped and the material is discharged to obtain an isocyanate prepolymer.

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Abstract

The invention discloses an isocyanate prepolymer. The isocyanate prepolymer is prepared from isocyanate and amino silane by a reaction. A -NCO group in isocyanate is subjected to a reaction with -NH2in amino silane, carbamido (-NH-CO-NH-) is generated, and the isocyanate prepolymer with adjustable isocyanate index and low viscosity is formed. According to polyurethane flexible foam synthesized from the isocyanate prepolymer, hard segment content of the polyurethane flexible foam can be increased by carbamido, and therefore, mechanical performance of the polyurethane flexible foam is improved.Meanwhile, by means of amino silane, Si-OR groups are uniformly distributed in the isocyanate prepolymer, the Si-OR groups are subjected to hydrolytic polycondensation to form a Si-O-Si crosslinkingstructure, crosslinking density of functional groups of the polyurethane flexible foam is increased, and the polyurethane flexible foam with improved tensile strength and tear strength is obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an isocyanate prepolymer and its preparation method and application. Background technique [0002] The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeated carbamate groups (-NH-CO-O-) on the main chain of the molecular chain. It is formed by addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compound. The types of polyurethane raw materials and the variety of characteristic groups in the polymer make the physical structure of polyurethane complex. Products with different properties can be made by adjusting the types and proportions of raw materials. The forms of polyurethane products include soft, semi-rigid and rigid foam plastics, elastomers, coatings, adhesives, sealants, synthetic leather coating resins, elastic fibers, etc. All kinds of products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/38C08G18/76C08G18/48C08G101/00
CPCC08G18/3893C08G18/4829C08G18/7614C08G18/7621C08G2110/0008
Inventor 黄少娟
Owner YJ企业有限公司
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