Quick-curing high-strength single-component silane modified polyurethane sealing gum preparation method

A polyurethane sealant and silane modification technology, applied in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve poor surface adhesion, fatigue failure, heat resistance, and water resistance Poor problems, to achieve excellent weather resistance, increase the curing rate, high strength effect

Active Publication Date: 2018-03-27
SHANDONG NORTH MODERN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyurethane refers to a class of polymers containing repeated urethane segments in the macromolecular chain. It has the advantages of high strength, strong tear resistance, softness and excellent wear resistance. It is widely used in elastomers, coatings, and adhesives. and sealant field, but the main disadvantage of the current polyurethane sealant is that the isocyanate end group reacts with the moisture in the air to release carbon dioxide during curing, causing cells or even cracks in the polyurethane body, and its curing speed is slow, and the surface is prone to cracks. sticky; and the current one-component polyurethane sealant has poor surface adhesion, low creep resilience performance, and is prone to fatigue failure
[0003] Polyurethane sealant has excellent mechanical properties, good elasticity, low temperature resistance, and good adhesion; but it has poor heat resistance and water resistance, and it will release CO when curing. 2 Make the adhesive layer foam, when the temperature and humidity are too low, the curing is slow
[0004] Silicone sealant cures quickly, does not foam, and can be firmly bonded to the surface of non-porous materials. The adhesive layer is heat-resistant and aging-resistant, but its decoration is poor, and the contents of the adhesive layer are easy to dialysis and migration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of fast-curing, high-strength one-component silane-modified polyurethane sealant, comprising the following steps:

[0046] ①Add 45kg of polyether polyol into a reaction kettle equipped with a thermometer, agitator and protected by dry nitrogen, start stirring, heat up to 120°C, vacuum dry and dehydrate for 2 hours, cool down to below 40°C, add 12kg of toluene di Isocyanate, 0.05kg of the first catalyst dibutyltin dilaurate and 15kg of dibutyl phthalate, heat up to 45°C, react until the NCO% content reaches 5%, stop the reaction, cool down to below 40°C, add 13kg Aminoethylaminopropyltrimethoxysilane is capped, and the NCO% is sampled every 15 minutes until the NCO% content is 0, and the SPU prepolymer is obtained, sealed and stored, and placed for later use;

[0047] Wherein the molecular weight of polyether polyol is 2000, and functionality is 2;

[0048] ② Add 25kg of the SPU prepolymer obtained in step ①, 10kg of dibutyl phthalate, 10kg of nano-...

Embodiment 2

[0050] A preparation method of fast-curing, high-strength one-component silane-modified polyurethane sealant, comprising the following steps:

[0051] ①Add 70kg of polyether polyol into a reaction kettle equipped with a thermometer, agitator and protected by dry nitrogen, start stirring, heat up to 120°C, vacuum dry and dehydrate for 2 hours, cool down to below 40°C, and add 8kg of hexamethylene base diisocyanate, 0.1kg dimorpholine diethyl ether and 35kg dioctyl phthalate, heat up to 60°C, react until the NCO% content reaches 2.5%, stop the reaction, cool down to below 40°C, and add 11kg of aminopropyltrimethoxysilane was capped, and the NCO% was sampled every 15 minutes until the NCO% content was 0, and the SPU prepolymer was obtained, sealed and stored, and placed for later use;

[0052] Wherein the molecular weight of polyether polyol is 5000, and functionality is 2;

[0053] ② Add 50kg of the SPU prepolymer obtained in step ①, 25kg of dioctyl phthalate, 10kg of fumed sil...

Embodiment 3

[0055] A preparation method of fast-curing, high-strength one-component silane-modified polyurethane sealant, comprising the following steps:

[0056] ①Put 55kg polyether polyol into a reaction kettle equipped with a thermometer, agitator and protected by dry nitrogen, start stirring, heat up to 120°C, vacuum dry and dehydrate for 2 hours, cool down to below 40°C, add 10kg of diphenyl Methane diisocyanate, 1,8-diazabicycloundec-7-ene and 25kg didecyl phthalate, heat up to 45~60°C, react until the NCO% content reaches 2%, stop the reaction, cool down to Below 40°C, add 11kg of aminopropyltriethoxysilane to the reaction kettle for end-capping, take a sample every 15 minutes to detect the NCO%, until the NCO% content is 0, get the SPU prepolymer, seal it and store it for later use;

[0057] Wherein the molecular weight of polyether polyol is 3000, and functionality is 2;

[0058] ② Add 30kg of the SPU prepolymer obtained in step ①, 12kg didecyl phthalate, 20kg light calcium carb...

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Abstract

The invention discloses a quick-curing high-strength single-component silane modified polyurethane sealing gum preparation method. The preparation method comprises the steps: adding polyether glycol into a reaction kettle which is provided with a thermometer and a stirrer and protected by dry nitrogen; starting stirring; warming to 120 DEG C; vacuum drying for dewatering for 2h; cooling to 40 DEGC or less; sequentially adding polyisocyanate, a first catalyst and a first plasticizer; warming to 45 to 60 DEG C; reacting and stopping reacting when a NCO% content reaches to 1% to 5%; cooling to 40 DEG C or less; adding a silane coupling agent into the reaction kettle and sealing ends; sampling and detecting NCO% every 15 minutes until the NCO% content is 0 to obtain SPU prepolymer; sealing, storing and standing for standby application. The preparation method disclosed by the invention has the advantages avoiding side reaction under high temperature, effectively controlling a molecular weight of the SPU prepolymer within a narrower range (generally 5000 to 9000), ensuring quality of the prepolymer and effectively improving the curing speed of SPU sealing gum.

Description

technical field [0001] The invention relates to the technical field, in particular to a preparation method of a fast-curing, high-strength one-component silane-modified polyurethane sealant. Background technique [0002] Polyurethane refers to a class of polymers containing repeated urethane segments in the macromolecular chain. It has the advantages of high strength, strong tear resistance, softness and excellent wear resistance. It is widely used in elastomers, coatings, and adhesives. and sealant field, but the main disadvantage of the current polyurethane sealant is that the isocyanate end group reacts with the moisture in the air to release carbon dioxide during curing, causing cells or even cracks in the polyurethane body, and its curing speed is slow, and the surface is prone to cracks. sticky; and the current one-component polyurethane sealant has poor surface adhesion, low creep resilience, and is prone to fatigue failure. [0003] Polyurethane sealant has excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/06C09J11/04C08G18/48C08G18/28
CPCC08G18/289C08G18/48C08K3/04C08K5/5425C08K5/5435C08K5/544C08K5/548C08K13/02C08K2003/265C09J11/04C09J11/06C09J175/08
Inventor 王玉东杜厚俊董斌王力于春英张健伟
Owner SHANDONG NORTH MODERN CHEM IND
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