Amino resin modified novolac epoxy resin anti-corrosion stain-resistant powder coating and metal precast slab anti-corrosion stain-resistant coating

A phenolic epoxy resin, amino resin modification technology, applied in epoxy resin coatings, powder coatings, anti-corrosion coatings, etc., can solve the problem of insufficient surface hardness of pure epoxy powder coatings and poor surface release properties of metal prefabricated boards , not resistant to sand and gravel scratches, etc., to achieve the effect of low friction coefficient, hydrophobicity, easy demoulding, and strong alkali resistance

Active Publication Date: 2022-02-25
江苏佳搏实业发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface hardness of pure epoxy powder coating is insufficient. When it is used as the surface coating of metal prefabricated panels, it is not resistant to sand and stone scratches, and has poor stain resistance, resulting in poor mold release on the surface of metal prefabricated panels.

Method used

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  • Amino resin modified novolac epoxy resin anti-corrosion stain-resistant powder coating and metal precast slab anti-corrosion stain-resistant coating
  • Amino resin modified novolac epoxy resin anti-corrosion stain-resistant powder coating and metal precast slab anti-corrosion stain-resistant coating
  • Amino resin modified novolac epoxy resin anti-corrosion stain-resistant powder coating and metal precast slab anti-corrosion stain-resistant coating

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preparation example Construction

[0037] In the present invention, the preparation method of described amino resin modified novolac epoxy resin preferably comprises the following steps:

[0038] The amino resin, the novolac epoxy resin, the quaternary ammonium salt catalyst and the organic solvent are mixed, and the modification reaction is carried out to obtain the amino resin modified novolak epoxy resin.

[0039] In the present invention, the quaternary ammonium salt catalyst is preferably one or more of benzyltriethylammonium chloride, benzyltrimethylammonium bromide and ethyltriphenylammonium bromide. In the present invention, the mass ratio of the novolac epoxy resin to the quaternary ammonium salt catalyst is preferably 100:0.1-2, more preferably 100:1.

[0040] In the present invention, the organic solvent is preferably one or more of toluene, xylene, dimethyl sulfoxide and n-hexane.

[0041] In the present invention, the mixing method is preferably stirring and mixing. In the present invention, the ...

Embodiment 1

[0078] A kind of anti-corrosion and stain-resistant coating for metal building prefabricated panels

[0079] Wherein anti-corrosion and stain-resistant powder coating formulation (parts by mass):

[0080]

[0081] The preparation of amino resin modified novolac epoxy resin:

[0082] Add 50 parts of o-cresol novolac epoxy resin to a 500ml three-necked flask, continue to add 150 parts of toluene solution, and continue stirring to dissolve at a speed of 500r / min. After the system is completely dissolved, add a total of 33 parts of melamine formaldehyde resin in three times, add 11 parts each time, keep stirring at a constant speed until completely dissolved, continue adding 0.5 parts of benzyltriethylammonium chloride catalyst to the three-necked flask, linear Raise the temperature to 90°C, control the heating rate at 5°C / min, continue the reaction for 2 hours, and the reaction ends. The reaction product is removed from the solvent by vacuum, which is the desired amino resin...

Embodiment 2

[0086] A kind of anti-corrosion and stain-resistant coating for metal building prefabricated panels

[0087] Wherein anti-corrosion and stain-resistant powder coating formulation (parts by mass):

[0088]

[0089]

[0090] The preparation of amino resin modified novolac epoxy resin:

[0091] Add 50 parts of phenol novolac epoxy resin into a 500ml three-necked flask, continue to add 150 parts of toluene solution, and continue stirring to dissolve at a speed of 500r / min. After the system is completely dissolved, add a total of 30 parts of urea-formaldehyde resin three times, adding 10 parts each time, keep stirring at a constant speed until it is completely dissolved, continue to add 0.5 parts of benzyltriethylammonium chloride catalyst to the three-necked flask, and raise the temperature linearly To 90°C, the heating rate was controlled at 5°C / min, the reaction was continued for 2 hours, and the reaction ended. The reaction product is removed from the solvent by vacuum,...

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Abstract

The invention provides an amino resin modified novolac epoxy resin anti-corrosion stain-resistant powder coating and a metal precast slab anti-corrosion stain-resistant coating, which belong to the technical field of powder coatings. The amino resin modified novolac epoxy resin is used as a powder coating matrix, after the novolac epoxy resin is modified by the amino resin, an N-containing group can be introduced, the hardness and alkali corrosion resistance of the novolac epoxy resin are improved, meanwhile, the amino resin can improve the crosslinking density of the resin, and the alkali corrosion resistance is further improved. The powder coating provided by the invention contains the polytetrafluoroethylene-containing wax powder, and the polytetrafluoroethylene-containing wax powder has low surface energy and high stain resistance, and can migrate to the surface of a coating of the powder coating in the use process, so that the adhesion between cured concrete and the coating is reduced, and the demolding property of the coating is improved. The powder coating provided by the invention contains the silicon-containing filler, so that the coating surface has higher surface hardness and lower friction coefficient, and the wear resistance of the coating is improved.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to an amino resin-modified phenolic epoxy resin anti-corrosion and anti-fouling powder coating and an anti-corrosion and anti-fouling coating for metal prefabricated panels. Background technique [0002] The main structure of modern buildings is generally supported by formwork and cast concrete. Formwork engineering accounts for more than 30% of the total cost of reinforced concrete projects. The metal prefabricated panels currently used in the industry have the advantages of high strength and rigidity, strong versatility, tight joints between formwork, many turnover times, smooth surface, no water absorption and slurry leakage, etc., but there are also common problems that the metal surface is easily corroded and worn. [0003] In order to solve the above problems, some construction companies on the market directly passivate the metal panels to make concrete prefabricated p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/08C09D5/03C09D7/61C09D7/65
CPCC09D163/00C09D5/08C09D5/033C08L27/18C08K3/34C08K3/36
Inventor 古涛魏敏杨平庆高杰陶旭初
Owner 江苏佳搏实业发展集团有限公司
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