Polyurea adhesive composition and preparation method thereof

A technology of adhesives and compositions, applied in the direction of polyurea/polyurethane adhesives, adhesive types, non-polymer adhesive additives, etc., can solve the problem of large shrinkage stress, increased cost input, polyurea materials Fast curing speed and other issues, to achieve the effect of high bond strength and reduce stress shrinkage

Inactive Publication Date: 2017-06-30
北京奥润联创微电子科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fast curing speed and large shrinkage stress of polyurea materials have brought challenges to the construction, and related construction tools are required, which increases the cost input

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Add 4,4'-diaminodicyclohexylmethane and diethyl maleate into the reaction flask at a molar ratio of 1.5:1, raise the temperature to 85°C, and stop the reaction until the primary amine in the detected product is completely converted into a secondary amine Reaction, then add nano-silica nanoparticles by 1% of the total weight of the polyurea binder composition, the particle size is 12nm, after ultrasonic dispersion for 15min at a frequency of 50Hz and stirring evenly, add metered hexamethylene diisocyanate, A polyurea adhesive composition is obtained. The polyurea adhesive has a gel time of 60 minutes and a tensile strength of 5.5 MPa.

Embodiment 2

[0033] Add 3,3-dimethyl-4,4'-diaminodicyclohexylmethane and dipropyl maleate into the reaction flask at a molar ratio of 1.05:1, raise the temperature to 85°C, and react into the detected product After the amine is completely converted into a secondary amine, stop the reaction, then add 1% of nano-titanium dioxide nanoparticles by the total weight of the polyurea adhesive composition, the particle size is 20nm, and stir evenly after ultrasonic dispersion at a frequency of 90Hz for 20min, and add the measured polyester A similar terminal isocyanate prepolymer to obtain a polyurea adhesive composition. The polyurea adhesive had a gel time of 50 minutes and a tensile strength of 5.8 MPa.

Embodiment 3

[0035] Add 4,4'-diaminodiphenyl sulfide and diisooctyl maleate into the reaction flask at a molar ratio of 0.8:1, raise the temperature to 85°C, and react until the primary amine in the detected product is completely converted into a secondary amine Stop the reaction, then add nano-titanium dioxide nanoparticles by 1% of the total weight of the polyurea binder composition, the particle size is 30nm, and stir evenly after ultrasonic dispersion at a frequency of 50Hz for 20min, add metered 4,4-dicyclohexylmethane di isocyanate to obtain a polyurea adhesive composition. The polyurea adhesive has a gel time of 80 minutes and a tensile strength of 6.5 MPa.

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Abstract

The invention discloses a polyurea adhesive composition and a preparation method thereof. The polyurea adhesive composition is mainly prepared from polyaspartic ester, nanofiller and a curing agent. The polyaspartic ester is prepared by enabling an organic diamine compound and maleate to make a Michael addition reaction; the curing agent is prepared from an organic diisocyanate or polyisocyanate component, and can be a monomer, a polymer, a derivative of isocyanate, a prepolymer or a semi-prepolymer; the nanofiller is selected from nano-silicon dioxide, nano-titanium dioxide and nano-silicon carbide. By utilizing the Michael addition reaction of the organic diamine compound and the maleate, primary amine is transformed into secondary amine on the one hand, and a group having higher steric hindrance is introduced on the other hand, so that the defects that a polyurea material is rapid in reaction time and short in gelation time are overcome; the nanofiller is added into the polyurea adhesive composition, so that the stress shrinkage caused during the curing of an adhesive film is effectively reduced, and the polyurea adhesive composition is high in bonding strength.

Description

technical field [0001] The invention belongs to the field of adhesives, and in particular relates to a polyurea adhesive composition and a preparation method thereof. Background technique [0002] Polyurea material is an elastomeric material produced by the reaction of isocyanate components and amino compound components. It is a new type of green material developed abroad in the past ten years to meet the needs of environmental protection. The biggest feature of polyurea system is fast curing reaction, energy saving and high efficiency. It has been greatly developed in my country. With the rapid development in recent years, it has been widely used in chemical protection, pipeline anticorrosion, marine anticorrosion, tunnel waterproofing and high-speed rail. , wind power and other fields of the national economy. Because it does not contain catalysts, it can be quickly cured, and can be sprayed on any curved surface, slope and vertical surface, without sagging, and can reach w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/02C09J11/04
CPCC09J175/02C08K3/22C08K3/36C08K2003/2241C09J11/04
Inventor 郑冬琛
Owner 北京奥润联创微电子科技开发有限公司
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