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A kind of polyurethane corner glue with high bonding strength and preparation method thereof

A technology of polyurethane and corner glue, used in polyurea/polyurethane adhesives, non-polymer adhesive additives, adhesives, etc., can solve the problems of instability and high viscosity of polyurethane adhesives

Active Publication Date: 2021-02-02
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with hydrophobic silica, hydrophilic fumed silica has a larger surface area and more surface hydroxyl content, and the thixotropic and reinforcing effects are more obvious in polyurethane systems. However, the hydroxyl groups on the surface of hydrophilic silica will interact with the single-component The isocyanate group in the polyurethane adhesive system reacts, so the polyurethane adhesive prepared with it as raw material often has high viscosity and is unstable, so the application in the one-component polyurethane adhesive formulation is limited

Method used

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  • A kind of polyurethane corner glue with high bonding strength and preparation method thereof
  • A kind of polyurethane corner glue with high bonding strength and preparation method thereof

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preparation example Construction

[0049] The present invention provides a kind of preparation method of the polyurethane group corner glue of high bonding strength described in above-mentioned technical scheme, comprises the following steps:

[0050] Mix the polyurethane prepolymer, plasticizer, filler, catalyst, defoamer and modified hydrophilic silica at 20-70°C, and stir for 2-5 hours to obtain high-adhesive-strength polyurethane corner glue;

[0051] The polyurethane prepolymer is composed of isocyanate, difunctional polyether polyol, tetrafunctional polyether polyol and trifunctional polyether polyol with a mass ratio of 30-50:3-10:3-10:30-60 made by reaction;

[0052] The modified hydrophilic white carbon black is prepared by reacting epoxy silane with a mass ratio of 1-10:100 and hydrophilic white carbon black.

[0053] In the present invention, the types and amounts of the polyurethane prepolymer, plasticizer, filler, catalyst, defoamer and modified hydrophilic silica are consistent with those describ...

Embodiment 1

[0060] Preparation of isocyanate-terminated polymers:

[0061] Add 200g trifunctional polyether polyol (average molecular weight 5000g / mol), 20g difunctional polyether polyol (average molecular weight 400g / mol), 20g tetrafunctional polyether polyol (average molecular weight 400g / mol) to In a reactor equipped with mechanical stirring, vacuum, nitrogen protection and heating device, stir at 90°C and dry in vacuum for 3h; then cool down to 30°C, add 180g of diphenylmethane diisocyanate, react at 70°C for 2h under vacuum, then The temperature is lowered to <40°C, and the isocyanate-terminated polymer is obtained after discharging. The R value of the isocyanate-terminated polymer is 3.42;

[0062] Preparation of modified hydrophilic silica:

[0063] Disperse 20g of hydrophilic silica A380 in 100g of toluene solution, stir and disperse at 110°C for 30min; then add 2g of γ-glycidyl etheroxypropyl trimethoxysilane, continue to stir and disperse at 110°C for 120min, cool, filter, and ...

Embodiment 2

[0071] Preparation of isocyanate-terminated polymers:

[0072] Add 200g trifunctional polyether polyol (average molecular weight 5000g / mol), 20g difunctional polyether polyol (average molecular weight 400g / mol), 20g tetrafunctional polyether polyol (average molecular weight 400g / mol) to In a reactor equipped with mechanical stirring, vacuum, nitrogen protection and heating device, stir at 90°C and dry in vacuum for 3h; then cool down to 30°C, add 180g of diphenylmethane diisocyanate, react at 70°C for 2h under vacuum, then The temperature was lowered to <40°C, and the material was discharged to obtain an isocyanate-terminated polymer. The R value of the isocyanate-terminated polymer was 3.42;

[0073] Preparation of modified hydrophilic silica:

[0074] Disperse 20g of hydrophilic silica A380 in 100g of toluene solution, stir and disperse at 110°C for 30min; then add 1g of γ-glycidyl etheroxypropyl trimethoxysilane, continue to stir and disperse at 120°C for 100min, cool, fil...

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Abstract

The invention provides a high-adhesive polyurethane corner glue and a preparation method thereof. The polyurethane corner glue includes the following components in parts by weight: 60-90 parts of polyurethane prepolymer, 4-10 parts of plasticizer parts, 0-20 parts of filler, 0.01-1 part of catalyst, 0.5-3 parts of defoamer and 3-10 parts of modified hydrophilic silica; the mass ratio of the polyurethane prepolymer is 30-50:3- 10:3~10:30~60 isocyanate, difunctional polyether polyol, tetrafunctional polyether polyol and trifunctional polyether polyol are reacted; the modified hydrophilic white carbon black is obtained by mass ratio It is prepared by reacting epoxy silane and hydrophilic white carbon black at a ratio of 1 to 10:100. The above-mentioned group of corner glues has higher bonding strength and better stability. This group of corner glue can improve the structural bonding strength of the corners of wooden doors and windows; it can also greatly improve the bonding strength of the corners of aluminum alloy doors and windows.

Description

technical field [0001] The invention belongs to the technical field of bonding and sealing, and in particular relates to a polyurethane corner glue with high bonding strength and a preparation method thereof. Background technique [0002] Corner rubber was first introduced from Europe. At present, a large number of corner rubber products in China are developed according to the performance of foreign products. However, the domestic and foreign door and window markets are very different. Foreign countries mainly use wooden door and window structures, while domestic aluminum alloy doors and windows and aluminum-plastic composite doors and windows are the main products, and the amount of wooden doors and windows is relatively small. When the corner glue products are used in Europe, the basic performance shall be tested according to the requirements of EN204 "Classification of thermoplastic wood adhesives for non-structural applications". Tensile Shear Strength Test Method of Jo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/04C08G18/48
CPCC08G18/4812C09J11/04C09J175/08C08K9/06C08K3/36
Inventor 李云龙陶小乐陈丹应天祥何永富
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD
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