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Low-surface-energy moisture-curable polyurethane hot melt adhesive and preparation method thereof

A technology of polyurethane hot-melt adhesive and low surface energy, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., which can solve the problem of high melt viscosity, reduce the NCO content of the finished adhesive, and the initial and final adhesive strength Low-level problems, to achieve the effect of simplifying the reaction process, increasing the curing speed, and shortening the reaction time

Active Publication Date: 2018-07-06
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many studies on polyester or polyester polyether mixed polyurethane hot melt adhesives, there are problems such as high melt viscosity and poor wettability. Low viscosity, good water resistance, low cost, etc., but low initial and final adhesive strength, poor temperature resistance, and high surface energy, which cannot meet the requirements for non-polar plastics, superhydrophobic fabrics, silicone oil modified fabrics, etc. Bonding of Surface Energy Substrates
In addition, although there are currently researches on the use of siloxane capping to reduce the surface energy of hot melt adhesives, etc., generally silane coupling agents are used to react with prepolymers, not only the siloxane content is low, but it is not enough to improve the surface energy of hot melt adhesives and wettability, and will reduce the NCO content in the finished glue, and increase the reaction time for preparing hot melt adhesive, which will affect the stability of the colloid

Method used

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  • Low-surface-energy moisture-curable polyurethane hot melt adhesive and preparation method thereof
  • Low-surface-energy moisture-curable polyurethane hot melt adhesive and preparation method thereof
  • Low-surface-energy moisture-curable polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method for low surface energy moisture-cured polyurethane hot-melt adhesive, comprising the following steps:

[0033] Step 1: In parts by weight, take the following raw materials: 79.70 parts of silicone polyol with molecular weight of 2000g / mol, 10 parts of silane-terminated polyether with molecular weight of 5000g / mol, 20.25 parts of diphenylmethane diisocyanate, antioxidant 0.5 part of 1010, 0.05 part of stannous octoate and 1 part of white carbon black;

[0034] Step 2: Add silicone polyol and silane-terminated polyether into the reaction kettle, start stirring, and vacuum dehydrate at 120°C and -0.1Mpa for 2 hours to obtain the first mixture;

[0035] Step 3: Take a sample of the first mixture to test that the moisture is less than 100ppm, lower the temperature in the kettle to 75-85°C, add diphenylmethane diisocyanate under the protection of an inert gas, and react at a speed of 400 rpm for 2 hours to obtain the second mixture;

[0036] Step 4: Add...

Embodiment 2

[0038] A kind of preparation of low surface energy moisture curing polyurethane hot-melt adhesive, comprises the following steps:

[0039] Step 1: In parts by weight, take the following raw materials: 84 parts of silicone polyols with a molecular weight of 3000 g / mol, 15 parts of silane-terminated polyether with a molecular weight of 3000 g / mol, 15 parts of diphenylmethane diisocyanate, antioxidant 1.0 parts of 168, 0.03 parts of dibutyltin dilaurate and 1.5 parts of white carbon black;

[0040] Step 2: Add silicone polyol and silane-terminated polyether into the reaction kettle, start stirring, and vacuum dehydrate at 120°C and -0.1Mpa for 2 hours to obtain the first mixture;

[0041] Step 3: Take a sample of the first mixture to test that the moisture is less than 100ppm, lower the temperature in the kettle to 75-85°C, add diphenylmethane diisocyanate under the protection of an inert gas, and react at a speed of 500 rpm for 2 hours to obtain the second mixture;

[0042] St...

Embodiment 3

[0044] A kind of preparation of low surface energy moisture curing polyurethane hot-melt adhesive, comprises the following steps:

[0045] Step 1: In parts by weight, take the following raw materials: 85.7 parts of silicone polyols with a molecular weight of 3300 g / mol, 16 parts of silane-terminated polyurethane with a molecular weight of 8000 g / mol, 14.2 parts of diphenylmethane diisocyanate, and 1010 parts of antioxidant 0.5 part, 0.5 part of antioxidant 168, 0.08 part of stannous octoate and 2 parts of white carbon black;

[0046] Step 2: Add silicone polyol and silane-terminated polyurethane into the reaction kettle, start stirring, and vacuum dehydrate at 120°C and -0.1Mpa for 2 hours to obtain the first mixture;

[0047] Step 3: Take a sample of the first mixture to test that the moisture is less than 100ppm, lower the temperature in the kettle to 75-85°C, add diphenylmethane diisocyanate under the protection of an inert gas, and react at a speed of 450 rpm for 2 hours t...

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Abstract

The invention belongs to the technical field of polyurethane adhesives, and particularly relates to a low-surface-energy moisture-curable polyurethane hot melt adhesive and a preparation method thereof. The hot melt adhesive is mainly prepared by reaction of organosilicone polyhydric alcohol, silane terminated polymer and polyisocyanate, and is prepared from, by mass part, 70 to 90 parts of the organosilicone polyhydric alcohol, 10 to 20 parts of the silane terminated polymer, 10 to 25 parts of the polyisocyanate and 0.5 to 2.5 parts of an auxiliary. The low-surface-energy moisture-curable polyurethane hot melt adhesive prepared through the preparation method has low surface energy, low melting viscosity and excellent wettability, defoaming property and temperature resistance, has high bonding strength, flexibility, impact resistance and water resistance, is excellent in comprehensive performance, and can be particularly applied to adhesion of low-surface-energy base materials such asnonpolar plastic and a superhydrophobic fabric.

Description

technical field [0001] The invention belongs to the technical field of polyurethane adhesives, and in particular relates to a low-surface-energy moisture-curing polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] Moisture-curing polyurethane hot melt adhesive is a kind of polyurethane adhesive. In the 1940s, polyurethane adhesive began to become a member of many adhesives. After the 1980s, it developed rapidly. By adjusting its raw materials and formulas, polyurethane adhesives with different properties can be designed. So far, it has become a type of adhesive with a wide variety and wide application. The earliest types of polyurethane adhesives are mainly two-component reactive and hot-melt adhesives. Most of the two-component adhesives are organic solvent-based, which are easy to pollute the environment when used, and are cumbersome to mix and measure, and are often prone to ratio errors, which will affect the performance of use,...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/76C08G18/61C08G18/50C08G18/62
CPCC08G18/5096C08G18/61C08G18/6295C08G18/7671C09J175/08
Inventor 刘德富王黑龙宋红玮张生王仁鸿
Owner MIRACLL CHEM
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