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Preparation method of white one-component polyurethane corner-combining adhesive

A one-component, polyurethane technology, used in chemical instruments and methods, adhesive additives, other chemical processes, etc., can solve problems such as leakage and deformation of doors and windows, and achieve high bonding effect, good thixotropy and operational performance. Effect

Active Publication Date: 2013-10-30
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the problems existing in the above-mentioned prior art, the embodiment of the present invention provides a preparation method of a white one-component polyurethane corner glue. Overall strength; proper foaming during the curing process can effectively fill gaps and solve the problems of leakage, deformation and corner cracking of doors and windows; at the same time, it has the performance characteristics of fast curing speed, good toughness, and aging resistance

Method used

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  • Preparation method of white one-component polyurethane corner-combining adhesive
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  • Preparation method of white one-component polyurethane corner-combining adhesive

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preparation example Construction

[0017] The preparation method of the white one-component polyurethane group corner glue of the present invention, its preferred embodiment comprises steps:

[0018] Preparation of polyurethane prepolymer:

[0019] Each raw material of preparing polyurethane prepolymer comprises by mass parts:

[0020] 10-15 parts of small molecular weight difunctional polyether polyol, 30-40 parts of medium molecular weight difunctional polyether polyol, 10-25 parts of trifunctional polyether polyol, 40-50 parts of diphenylmethane diisocyanate ;

[0021] Add the low molecular weight difunctional polyether polyol, medium molecular weight difunctional polyether polyol and trifunctional polyether polyol into the synthesis reaction kettle, raise the temperature to 50°C, add diphenylmethane diisocyanate, and heat up To 60 ~ 80 ℃, react for 3 hours, the synthesis reaction is completed, and the polyurethane prepolymer is obtained;

[0022] Preparation of one-component polyurethane corner glue:

...

Embodiment 1

[0038] This embodiment 1 provides a preparation method of a white one-component polyurethane corner glue. The prepared corner glue has the characteristics of excellent bonding performance, good sealing performance, and fast curing speed. It is used for heat insulation (broken bridge) corner joints and corner joints of aluminum alloy doors and windows. The preparation method specifically includes:

[0039] Preparation of polyurethane prepolymer:

[0040] Get raw materials according to the following ratio:

[0041]

[0042]

[0043] Add 12 parts by mass of polyoxypropylene diol (molecular weight 400), 33 parts by mass of polyoxypropylene diol (molecular weight 2000), and 12 parts by mass of polyoxypropylene triol (molecular weight 4800) into the synthesis reactor In the middle, heat up to 50°C, add 43 parts by mass of diphenylmethane diisocyanate, heat up to 60-80°C, react for 3 hours, the measured viscosity is 8000mPa·s (25°C), the NCO part is 10.2, and the synthesis re...

Embodiment 2

[0048] The second embodiment provides a preparation method of a white one-component polyurethane corner glue. The prepared corner glue has excellent bonding performance, good sealing performance, and fast curing speed. It is used for heat insulation (broken bridge) corner joints and corner joints of aluminum alloy doors and windows. The preparation method specifically includes:

[0049] Preparation of polyurethane prepolymer:

[0050] Get raw materials according to the following ratio:

[0051]

[0052]

[0053] Add 10 parts by mass of polyoxypropylene diol (molecular weight 400), 33 parts by mass of polyoxypropylene diol (molecular weight 2000), and 12 parts by mass of polyoxypropylene triol (molecular weight 4800) into the synthesis reactor In the middle, heat up to 50°C, add 45 parts by mass of diphenylmethane diisocyanate, heat up to 60-80°C, react for 3 hours, the measured viscosity is 6000mPa·s (25°C), the NCO part is 11.3, and the synthesis reaction is completed...

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Abstract

The invention discloses a preparation method of a white one-component polyurethane corner-combining adhesive. The preparation method comprises the following steps: firstly utilizing bifunctional and tri-functional polyether glycols and diphenyl-methane-diisocyanate which have different molecular weights to carry out synthetic reaction under certain conditions to obtain a polyurethane prepolymer; and then kneading the prepared prepolymer with a plasticizer, inorganic fillers, an organosilicon adhesion promoter and catalysts to obtain the polyurethane corner-combining adhesive. The preparation method has the following beneficial effects: through structural design of the polyurethane prepolymer chain segment and reasonable regulation of the types and dosages of the inorganic fillers, the prepared polyurethane corner-combining adhesive has the characteristics of high bonding strength, high curing speed, good flexibility, appropriate foaming percentage and strong sealing function; the polyurethane corner-combining adhesive is used for bonding and sealing at the fillet positions and corners of the aluminium alloy doors and windows; and the corner-combining adhesive is completely environment-friendly and nontoxic and has excellent weather resistance.

Description

technical field [0001] The invention relates to the preparation technology of structural sealant, in particular to a preparation method of white one-component polyurethane corner glue. Background technique [0002] As the pace of infrastructure construction continues to accelerate, the quality of projects is also improving. Heat insulation (broken bridge) aluminum alloy doors and windows are used more and more widely in construction as a high-end door and window design. As a rigid structure, aluminum alloy doors and windows need to be bonded and sealed at the corner joints and corners to improve the overall strength and air tightness. [0003] The sealants currently on the market for this purpose are relatively complicated. There are epoxy adhesives. Although epoxy adhesives have high strength, epoxy has poor low-temperature toughness. For doors and windows exposed to the outside for a long time, the cold and heat shrinkage is relatively large, and epoxy adhesives are very...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C08G18/76C08G18/66C08G18/48C09K3/10
Inventor 刘滨罗善国
Owner BEIJING COMENS NEW MATERIALS
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