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Preparation method of bi-component siloxane modified polyurethane sealant

A technology of polyurethane sealant and siloxane modification, applied in the direction of polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problems of inability to guarantee the adhesive effect, limited application, and foaming of the adhesive layer. , to achieve the effect of good operation stability, wide applicability and high bonding effect

Inactive Publication Date: 2010-09-22
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane itself has its own shortcomings: the bonding of non-porous materials generally requires surface treatment with primer; high temperature and high humidity environments are likely to cause foaming of the adhesive layer; for NCO-terminated prepolymers, due to their sensitivity to moisture, Poor storage stability; in addition, the heat resistance of polyurethane sealant is average
The various deficiencies of the above-mentioned polyurethane sealant limit its application
Especially in the case of no primer, the adhesion effect on various materials such as glass, metal and various engineering plastics cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example 1 provides a preparation method of a two-component siloxane-modified polyurethane sealant. The prepared sealant has a wide range of bonding, excellent mechanical properties, and good operability, and is suitable for bonding and bonding of various substrates. Sealing, the preparation method specifically includes:

[0027] A. Preparation of polyurethane prepolymer:

[0028] The raw materials for preparing polyurethane prepolymer are calculated by mass percentage, including:

[0029] Dioctyl phthalate 10-25%, bifunctional polyether polyol 50-65% and diphenylmethane diisocyanate 10-25%;

[0030] Add dioctyl phthalate, difunctional polyether polyol and diphenylmethane diisocyanate into the synthesis reactor, raise the temperature to 60-80°C, and react for 3-5 hours. After the synthesis reaction is completed, polyurethane prepolymerized Body, which is a silicone modified polyurethane prepolymer;

[0031] The step of preparing polyurethane prepolymer can also i...

Embodiment 2

[0060] This embodiment 2 provides a preparation method of a two-component siloxane-modified polyurethane sealant, and the prepared sealant can be applied to various non-porous materials, engineering plastics, and various paint substrates treated with no primer Bonding and sealing, the preparation method specifically includes:

[0061] A. Preparation of polyurethane prepolymer:

[0062] Get raw materials according to the following ratio:

[0063] Raw material ratio (parts by mass)

[0064] Polyoxypropylene diol (molecular weight is 2000) 65

[0065] Dioctyl phthalate 20

[0066] Diphenylmethane diisocyanate 15

[0067] Add 20 parts by mass of dioctyl phthalate, 65 parts by mass of bifunctional polyether polyol, and 15 parts by mass of diphenylmethane diisocyanate into the synthesis reactor, raise the temperature to 60-80°C, and react After 3 hours, the measured viscosity was 8000mPa·s (25°C), the NCO% was 2.30, the synthesis reaction was completed, and a polyurethane prepo...

Embodiment 3

[0093] This embodiment three provides a method for preparing a two-component siloxane-modified polyurethane sealant. The prepared sealant can be applied to various non-porous materials and engineering plastics treated with no primer, and to various paint surfaces Bonding and sealing of substrates, etc., the preparation method specifically includes:

[0094] A. Preparation of polyurethane prepolymer:

[0095] Get and prepare each raw material of polyurethane prepolymer according to following proportioning:

[0096] Raw material ratio (parts by mass)

[0097] Polyoxypropylene diol (molecular weight is 2000) 60

[0098] Polyoxypropylene triol (molecular weight is 5000) 5

[0099] Dioctyl phthalate 17

[0100] Diphenylmethane diisocyanate 18;

[0101] The dioctyl phthalate of 17 mass parts, the difunctional polyether polyol of 60 mass parts, the trifunctional polyether polyol of 5 mass parts, the diphenylmethane diisocyanate of 18 mass parts are added to synthetic In the rea...

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Abstract

The invention discloses a preparation method of a bi-component siloxane modified polyurethane sealant, which belongs to the technical field of sealants. The method comprises the following steps: preparing a polyurethane prepolymer; carrying out synthetic reaction to obtain the polyurethane prepolymer under certain conditions by using two-function polyether glycol, diphenylmethane diisocyanate, plasticizer and siloxane containing amino groups; using the prepared prepolymer, inorganic filler, plasticizer and organosilicon adhesion accelerant as the first component of the sealant; and using inorganic filler, diluter, curing agent, surfactant, and dibutyltin dilaurate or tertiary amine catalyst as the second component. By designing the structure of the end silane polyurethane prepolymer and adjusting the proportion of the inorganic filler, in cooperation with a proper curing system and catalysis system, the prepared sealant has the characteristics of high curing speed, good adhesion effect and the like. The sealant has the advantages of high mechanical properties, good elasticity, no toxicity, no irritative gas emission and outstanding weatherability.

Description

technical field [0001] The invention relates to the field of preparation of sealant, in particular to a preparation method of a two-component siloxane-modified polyurethane sealant. Background technique [0002] At present, general-purpose polyurethane sealants have been widely used in civil fields, including many fields such as automobiles and construction, due to their good elasticity, good low-temperature flexibility, wear resistance, and high physical and mechanical properties. However, polyurethane itself has its own shortcomings: the bonding of non-porous materials generally requires surface treatment with primer; high temperature and high humidity environments are likely to cause foaming of the adhesive layer; for NCO-terminated prepolymers, due to their sensitivity to moisture, The storage stability is poor; in addition, the heat resistance of polyurethane sealant is average. Various deficiencies of the above-mentioned polyurethane sealant limit its application. Es...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/06C09J11/04C08G18/83C09K3/10
Inventor 刘滨
Owner BEIJING COMENS NEW MATERIALS
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