A kind of organic montmorillonite modified two-component polyurethane adhesive and preparation method thereof

A two-component polyurethane and polyurethane adhesive technology, applied in non-polymer adhesive additives, dyed low-molecular organic compound treatment, adhesive additives, etc., can solve poor bonding performance, poor solvent resistance, mechanical properties, etc. poor performance

Inactive Publication Date: 2011-12-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of ordinary polyurethane film, such as poor bonding performance, poor mechanical properties, poor heat resistance, poor solvent resistance, poor light transmission, etc. Modification of polyurethane adhesive to greatly improve its mechanical properties, heat resistance, solvent resistance and transparency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Purify the montmorillonite: use the sedimentation method to disperse the montmorillonite in a certain amount of deionized water to prepare a suspension with a certain concentration, let it stand for 24 hours, and take the upper liquid for use.

[0025] The volume ratio of the suspension montmorillonite mass to deionized water is 1:15.

[0026] (2) Organicization of montmorillonite: Dissolve quaternary ammonium salt larger than the ion exchange capacity of montmorillonite in 75ml of ethanol and water mixture, and stir evenly. The upper layer liquid obtained in step (1) was placed in a constant temperature water bath at 80°C, and dodecyltrimethylammonium chloride solution was added dropwise under strong stirring, reacted and left standing for 24 hours to obtain a white precipitate. Wash with deionized water until the white precipitate is free of chloride ions, dry in an oven at 70°C, grind through a sieve, and set aside.

[0027] The volume ratio of water and ethanol...

Embodiment 2

[0031] (1) Purify the montmorillonite: use the sedimentation method to disperse the montmorillonite in a certain amount of deionized water to prepare a suspension with a certain concentration, let it stand for 24 hours, and take the upper liquid for use.

[0032] The volume ratio of the suspension montmorillonite mass to deionized water is 1:10.

[0033] (2) Organicization of montmorillonite: Dissolve quaternary ammonium salt larger than the ion exchange capacity of montmorillonite in 50 ml of ethanol and water mixture, and stir evenly. The upper layer liquid obtained in step (1) was placed in a constant temperature water bath at 80°C, and dodecyltrimethylammonium chloride solution was added dropwise under strong stirring, reacted and left standing for 24 hours to obtain a white precipitate. Wash with deionized water until the white precipitate is free of chloride ions, dry in an oven at 70°C, grind through a sieve, and set aside.

[0034] The volume ratio of water to ethanol...

Embodiment 3

[0038] (1) Purify the montmorillonite: use the sedimentation method to disperse the montmorillonite in a certain amount of deionized water to prepare a suspension with a certain concentration, let it stand for 24 hours, and take the upper liquid for use.

[0039] The volume ratio of the suspension montmorillonite mass to deionized water is 1:20.

[0040] (2) Organicization of montmorillonite: take by weighing a quaternary ammonium salt larger than the ion exchange capacity of montmorillonite, dissolve it in a mixed solution of 100ml of ethanol and water, and stir evenly. The upper layer liquid obtained in step (1) was placed in a constant temperature water bath at 80°C, and dodecyltrimethylammonium chloride solution was added dropwise under strong stirring, reacted and left standing for 24 hours to obtain a white precipitate. Wash with deionized water until the white precipitate is free of chloride ions, dry in an oven at 70°C, grind through a sieve, and set aside.

[0041] T...

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Abstract

The invention aims at the disadvantages of existing adhesives, adopts a solution intercalation method to obtain organic montmorillonite-modified polyurethane adhesives, and makes up for the shortcomings of previous polyurethane adhesives. The present invention adopts two-component adhesive, first adopts dodecyltrimethylammonium chloride and cetyltrimethylammonium bromide as organic intercalation agent to process montmorillonite, in acetone and polyol components The organic montmorillonite is dispersed, mixed with isocyanate components, and cured at room temperature to prepare a polyurethane/organic montmorillonite nanocomposite adhesive. Polyurethane molecules are inserted between the montmorillonite sheets, the organic montmorillonite has good compatibility with the matrix, and the dispersion is uniform, which improves the mechanical properties, thermal stability, solvent resistance and light transmittance of the adhesive.

Description

technical field [0001] The invention relates to a two-component polyurethane adhesive and a preparation method thereof, more specifically, to a two-component polyurethane adhesive modified by organic montmorillonite and a preparation method thereof. Background technique [0002] Polyurethane adhesive is an adhesive containing urethane group (-NHCOO-) or isocyanate group (-NCO) in the molecular chain, and forms a polyurethane film after curing. It contains groups with strong chemical activity. It not only has strong bonding ability with materials containing active hydrogen such as foam, plastic, wood, leather, paper, fabric, ceramics and other porous materials, but also has strong bonding ability with metal, glass, rubber, etc. Surface smooth materials such as PP also have good chemical adhesion, which can meet the bonding of different materials. In addition, it also has the characteristics of adjustable toughness, simple bonding process, and excellent low temperature resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/04C08G18/08C08K9/04C08K3/34C09C1/40C09C3/08
Inventor 侯信代春丽
Owner TIANJIN UNIV
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