Polyurethane primer and finishing coat combined coating

A technology of polyurethane primer and polyurethane resin, applied in the field of coatings, can solve problems such as easy corrosion, achieve high adhesion, excellent coating performance, and solve the effect of poor adhesion

Pending Publication Date: 2022-05-10
HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defect that the existing maintenance coating is easy to corrode, the present invention aims to provide a maintenance coating with high bonding strength, good sealing performance, resistance to salt spray, resistance to chemical agents, resistance to water vapor penetration, and wear resistance. , Impact resistance, sun exposure resistance, weather resistance and aging resistance are excellent coatings to solve the pain points of coating maintenance and maintenance. The service life of the coating can reach more than 3 years

Method used

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  • Polyurethane primer and finishing coat combined coating
  • Polyurethane primer and finishing coat combined coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of moisture-curing polyurethane primer and topcoat:

[0049] Preparation of Moisture Curing Polyurethane Primer:

[0050] Preparation of thickener slurry: Add 85kg of xylene solvent into the dispersing and stirring tank, add 5kg of BYK163 dispersant at 400rpm, stir 10kg of thickener for 10min, disperse at 1000rpm for 35min at high speed and mix well for later use.

[0051]Preparation of moisture-curing polyurethane primer: Add 9.35kg of Covestro E21 moisture-curing polyurethane resin, 3.7kg of xylene solvent, and 4.5kg of thickener slurry into the dispersion stirring tank, and add 81.73kg of zinc powder and 4kg of quartz powder at a speed of 400rpm , disperse at 1500rpm at high speed for 25 minutes, reduce the speed to 400rpm, add 0.5kg water absorbent ADDITIVE TI, 1kg Momentive MP200 silane, and stir evenly.

[0052] Preparation of top coat

[0053] Preparation of component A of the topcoat: add 50kg of Covestro NH1420 aspartate resin and 2kg of xylene so...

Embodiment 2

[0059] Preparation of moisture-curing polyurethane primer and topcoat:

[0060] Preparation of thickener slurry: Add 85kg of butyl acetate solvent into the dispersion stirring tank, add 5kg of ANTITERRA 203 dispersant and 10kg of BENTONE27 thickener at 600rpm and stir for 5min, then disperse at 1000rpm at high speed for 35min and mix evenly for later use.

[0061] Preparation of moisture-curing polyurethane primer: Add 30kg of Covestro E21 moisture-curing polyurethane resin, 18kg of butyl acetate solvent, and 20kg of thickener slurry into the dispersion stirring tank, add 32kg of zinc powder and 4kg of barium sulfate at 500rpm, and add 32kg of zinc powder at 1200rpm Disperse at high speed for 30 minutes, reduce the speed to 500rpm, add 0.5kg of water-absorbing agent ADDITIVE OF, 1kg of Momentive A187 silane, and stir evenly.

[0062] Preparation of top coat

[0063] Preparation of component A of the topcoat: Add 38kg of Feiyang F520 aspartate resin and 4kg of butyl acetate so...

Embodiment 3

[0069] Preparation of moisture-curing polyurethane primer and topcoat:

[0070] Preparation of thickener slurry: Add 85kg of trimethylbenzene solvent into the dispersing stirring tank, add 5kg of BYK110 dispersant at 600rpm, and 10kg of Hemings SD-2 thickener, stir for 10min, disperse at 1500rpm for 25min and mix evenly for later use.

[0071] Preparation of moisture-curing polyurethane primer: Add 10kg of Covestro E21 moisture-curing polyurethane resin, 14kg of trimethylbenzene solvent, and 16kg of thickener slurry into the dispersion stirring tank, add 60kg of zinc powder and 2kg of barium sulfate at 600rpm, and then add 60kg of zinc powder and 2kg of barium sulfate at a high speed of 1500rpm. Disperse for 35 minutes, reduce the rotation speed to 600rpm, add 0.5kg water absorbent ADDITIVE TI, 1kg Momentive A187 silane, and stir evenly.

[0072] Preparation of top coat

[0073] Preparation of component A of topcoat: Add 18kg Feiyang 420 aspartate resin, 42kg Nupace 1753 hydr...

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Abstract

The invention relates to a polyurethane primer and finish paint combined coating. The polyurethane primer and finish paint combined coating comprises a moisture-curing polyurethane primer and finish paint, the moisture-curable polyurethane primer is prepared from the following raw materials in parts by weight: 8 to 35 parts of NCO-terminated polyurethane resin, 0 to 2 parts of silane, 30 to 85 parts of zinc powder, 0 to 20 parts of anticorrosive filler, 8 to 50 parts of solvent and 1 to 6 parts of additive. The finish paint comprises a component A and a component B in a weight ratio of (2-8): 1; the component A comprises 18-60 parts of asparaginic acid ester resin, 0-42 parts of hydroxy acrylic resin, 20-50 parts of an anticorrosive filler, 0-2 parts of a molecular sieve, 0-4 parts of an auxiliary agent and 0-10 parts of a solvent; and the finish paint component B comprises an HDI polyurethane curing agent. Through the reaction of the components, the bonding strength between a coating system and a base material and an original coating is high, the sealing performance is good, salt mist resistance, chemical agent resistance, water vapor permeation resistance, abrasion resistance, impact resistance, sun exposure resistance, weather resistance, aging resistance and durability are achieved, the service life of the coating can reach three years or above, and the problem that frequent recoating is needed for maintaining the coating is solved.

Description

technical field [0001] The invention belongs to the technical field of coatings, and mainly relates to a combination coating of polyurethane primer and topcoat. Background technique [0002] At present, in the protection of steel materials such as ships, marine engineering equipment, marine equipment pipelines, petrochemical equipment pipelines, automobiles, household appliances, wastewater treatment, steel structures, bridges, and railways, commonly used alkyd coating systems, epoxy polyurethane coating systems, and amino baking paint systems , Epoxy polyester powder coating system, after the coating reaches a certain service life, the coating will have different corrosion conditions, especially the bolts, nuts, flange joints and other parts that are difficult to completely coat. The current common treatment plan is: [0003] The old paint coating is alkyd system. The maintenance plan is to paint alkyd paint after grinding, and paint again after rusting. It needs to be pai...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D175/02C09D5/10C09D7/63
CPCC09D175/04C09D175/02C09D5/106C09D7/63C08K2003/0893C08K3/08C08K5/5435
Inventor 李著初陆腾飞徐常利阳区朱辉煌叶志会
Owner HUNAN AEROSPACE SANFENG SCI & TECH CO LTD
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