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Direct-adhesion type polyurethane seal gum

A sealant and bonding technology, applied in the field of sealant, can solve the problems of reducing efficiency and increasing the steps of primer coating, etc., and achieve the effect of simplifying the automobile assembly process

Inactive Publication Date: 2006-02-08
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general polyurethane sealant can only show good adhesion after priming the surface to be bonded, which increases the step of priming for the sizing process and reduces efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] The following raw materials are selected to make the prepolymer:

[0037] Polyoxypropylene glycol 55%

[0038] Polyoxypropylene Triol 15%

[0039] Toluene diisocyanate 17%

[0040] Dibutyl phthalate 13%

[0041] The content of the prepared prepolymer isocyanate is 1.9%, and the viscosity at 25°C is 5600mpa.s.

[0042] Sealant production;

[0043] Prepolymer 48%

[0044] Carbon black 22%

[0045] Talc 25%

[0046] Vinyl tri-tert-butylperoxysilane 4.6%

[0047] Stannous octoate 0.4%

[0048] Detection scheme

Glass /

Iron sheets

Glass /

Aluminum sheet

Glass /

Galvanized sheet

glass / glass

FRP sheet

glass / black

side glass

Shear strength

(Mpa)

7.0

7.1

7.8

7.3

7.2

failure mode

cohesive

destroy

cohesive broken

Bad

cohesive broken

Bad

cohesive broken

Bad

cohesive broken

Bad

[0049] Cohes...

example 2

[0058] Select the following raw materials to make prepolymer

[0059] Polyoxypropylene glycol 57%

[0060] Polyoxypropylene Triol 10%

[0061] Isophorone Diisocyanate 18%

[0062] Diisononyl Phthalate 15%

[0063] The content of the prepared prepolymer isocyanate is 2.3%, and the viscosity at 25°C is 7600mpa.s.

[0064] Sealant production

[0065] Prepolymer 50%

[0066] Carbon black 22%

[0067] Talc 24%

[0068] Gamma-Propyltrimethoxysilane Methacrylate 3.5%

[0069] Tetramethylbutanediamine 0.5%

[0070] Detection scheme

Glass /

Iron sheets

Glass /

Aluminum sheet

Glass /

Galvanized sheet

glass / glass

FRP sheet

glass / black

side glass

Shear strength

(Mpa)

7.3

7.6

7.8

7.1

7.4

failure mode

cohesive

destroy

cohesive broken

Bad

cohesive broken

Bad

cohesive broken

Bad

cohesive broken

Bad

[00...

example 3

[0079] Select the following raw materials to make prepolymer

[0080] Polyoxypropylene glycol 68%

[0081] Polyoxypropylene Triol 8%

[0082] Diphenylmethane-4,4' diisocyanate 12%

[0083] Diisononyl Phthalate 12%

[0084] The content of the prepared prepolymer isocyanate is 2.5%, and the viscosity at 25°C is 7800mpa.s.

[0085] Sealant production

[0086] Prepolymer 30%

[0087] Carbon black 32%

[0088] Talc 28%

[0089] Y-Propyltrimethoxysilane Methacrylate 8.7%

[0090] Tetramethylbutanediamine 1.3%

[0091] Detection scheme

Glass /

Iron sheets

Glass /

Aluminum sheet

Glass /

Galvanized sheet

glass / glass

FRP sheet

glass / black

side glass

Shear strength

(Mpa)

7.6

7.8

7.0

7.5

7.4

failure mode

cohesive

destroy

cohesive broken

Bad

cohesive broken

Bad

cohesive broken

Bad

cohesive broke...

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Abstract

Disclosed is a direct adhesion type polyurethane seal gum, which is prepared by mixing isocyanate-containing pre-base stock, solid packing, silicane coupling agent and amines or tin compound catalyst. The seal gum can be used in fields including construction and automobile without the requirement for basecoat to achieve enough adhesion strength.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a polyurethane sealant containing silane groups. Background technique [0002] Polyurethane sealant is based on the reaction of NCO and active hydrogen compounds to cure. It is composed of polyurethane prepolymers with terminal NCO groups, fillers, plasticizers, and additives. Polyurethane sealants are mainly used in the construction and automotive industries, and their main functions are sealing and bonding. Even specialized sealants require a certain level of adhesion to the substrate. However, the general polyurethane sealant can only show good adhesion after priming the surface to be bonded, which increases the step of priming for the sizing process and reduces efficiency. In the automobile assembly process, the sealant required for the windshield glass has a high bonding strength. Now the polyurethane windshield adhesive commonly used in China needs to use a primer to en...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09K3/10
Inventor 陈宇沈峰邓煜东于钦亮
Owner BEIJING COMENS NEW MATERIALS
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