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Adhesive bottom coating agent for improving metal-surface polyurethane elastomer coating adhesion of metal surface and preparation method of adhesive bottom sizing agent

A polyurethane elastomer and metal surface technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor adhesion and shedding, and achieve the effects of accelerated drying speed, large cross-linking degree, and improved bonding strength

Inactive Publication Date: 2017-09-08
硕投(武汉)高分子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of bonding primer that improves the adhesion of polyurethane elastomer coating on metal surface, overcome the difficult problem of poor adhesion of existing solvent-free polyurethane elastomer coating on the surface of metal substrate, and make solvent-free polyurethane The elastomer obtains high bond strength on the metal surface, which effectively solves the problem of peeling off of the polyurethane elastomer coating under conditions such as cavitation, erosion and impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of moisture curing polyurethane resin:

[0040] In terms of mass, take 80 parts of diisocyanate (diphenylmethane diisocyanate) into the reaction kettle, gradually add 40 parts of alcoholyzed castor oil in batches, stir evenly, heat to 75°C, keep warm for 2-4 hours, and cool to room temperature , to obtain a moisture-cured polyurethane resin.

[0041] 2. Preparation of bonding primer:

[0042] Mix 60 parts of moisture-curing polyurethane resin, 0.4 part of adhesion promoter (KH560), 0.3 part of defoamer (modified polysiloxane Defom 5500), leveling agent (acrylate copolymer Levelol 495) ) and 15 parts of organic solvent (butyl acetate: xylene = 30: 40) were added to the dispersion tank, stirred at high speed to disperse evenly, and obtained the primer base material;

[0043] In terms of mass, 80 parts of organic zinc (KRZN1) and 10 parts of organic bismuth (KRBi-1) were mixed and stirred evenly to obtain a mixed catalyst;

[0044] In terms of mass, 0.02 ...

Embodiment 2

[0047] 1. Preparation of moisture curing polyurethane resin:

[0048] In terms of mass, take 100 parts of diisocyanate (toluene diisocyanate TDI) into the reaction kettle, gradually add 60 parts of alcoholyzed castor oil in batches, stir evenly, heat to 75°C, keep it warm for 2 to 4 hours, and cool to room temperature to obtain Moisture curing polyurethane resin.

[0049] 2. Preparation of bonding primer:

[0050] Mix 80 parts of moisture-curing polyurethane resin, 0.8 part of adhesion promoter (KH560), 0.8 part of defoamer (modified polysiloxane Defom 5500), leveling agent (acrylate copolymer Levelol 495) ) 1 part and 25 parts of organic solvent (butyl acetate: xylene = 30: 70), added to the dispersion tank, stirred at high speed to disperse evenly, to obtain the primer base material;

[0051] In terms of mass, 80 parts of organic zinc (KRZN1) and 20 parts of organic bismuth (KRBi-1) were mixed and stirred evenly to obtain a mixed catalyst;

[0052] In terms of mass, 0.08 ...

Embodiment 3

[0055] 1. Preparation of moisture curing polyurethane resin:

[0056] In terms of mass, take diisocyanate (70 parts of diphenylmethane diisocyanate, 20 parts of isophorone diisocyanate) into the reaction kettle, gradually add 50 parts of alcoholyzed castor oil in batches, stir evenly, and heat to 75°C , keep warm for 2 to 4 hours, and cool to room temperature to obtain a moisture-cured polyurethane resin.

[0057] 2. Preparation of bonding primer:

[0058] Mix 70 parts of moisture-curing polyurethane resin, 0.6 part of adhesion promoter (KH560), 0.5 part of defoamer (modified polysiloxane Defom 5500), leveling agent (acrylate copolymer Levelol 495) ) and 20 parts of organic solvent (butyl acetate: xylene = 30: 60) were added to the dispersion tank, stirred at high speed to disperse evenly, and obtained the primer base material;

[0059] In terms of mass, 80 parts of organic zinc (KRZN1) and 15 parts of organic bismuth (KRBi-1) were mixed and stirred evenly to obtain a mixed ...

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Abstract

The invention provides an adhesive bottom coating agent for improving metal-surface polyurethane elastomer coating adhesion and belongs to the field of adhesive bottom coating agents. The adhesive bottom coating agent is composed of a bottom coating agent base material and an accelerant, the bottom coating agent base material is composed of moisture-curing polyurethane resin, an adhesion promoter, a defoaming agent and an organic solvent, the moisture-curing polyurethane resin is a reaction product of diisocyanate with alcoholysis castor oil, and a bottom coating agent promoter is composed of a mixed catalyst of organic zinc with organic bismuth and the organic solvent; the bottom coating agent base material and the promoter are evenly and proportionally mixed and are applied to the surface of the base material by means of spraying, brushing, roll coating and the like, a solvent-free polyurethane elastomer is applied to the dried surface of the bottom coating agent after the surface is dried, and after 7 days of drying and curing, a solvent-free polyurethane elastomer coating has excellent adhesion strength on the metal surface.

Description

technical field [0001] The invention discloses a bonding primer for improving the adhesion of polyurethane elastomer coatings on metal surfaces and a preparation method thereof, belonging to the field of coatings, in particular to modified polyurethane coatings. Background technique [0002] Solvent-free polyurethane elastomer coating has excellent comprehensive properties such as wear resistance, impact resistance, cavitation resistance, water resistance, insulation, corrosion resistance and shock absorption, and has no VOC pollution. It is an environmentally friendly metal protective coating with high protection performance. Layer, widely used in hydropower, shipbuilding, petrochemical, mining machinery, bridges, hydraulic machinery and other fields. [0003] Reliable bond strength to metal substrates is a prerequisite for the protection and functionality of solvent-free polyurethane elastomer coatings. However, the solvent-free polyurethane elastomer coating has a fast d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/12C08G18/36C08G18/22C08G18/10C08G18/30
CPCC09D175/14C08G18/10C08G18/222C08G18/227C08G18/36C08L2205/03C08L83/04C08K5/5435C08G18/307
Inventor 吴成东郭旭东陶加法
Owner 硕投(武汉)高分子技术有限公司
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