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Porous substrate powder coating and preparation method thereof

A powder coating and porous bottom technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of unsatisfactory benzoin effect, poor leveling of powder coatings, surface smoothness of shrinkage holes, etc., and achieve defoaming and de-foaming. Good gas effect, good adhesion, low surface tension effect

Active Publication Date: 2017-05-24
ANHUI MEIJIA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the widespread application of powder coatings, some problems in the application of powder coatings in various fields have also been exposed, such as: powder coatings have poor leveling, pinholes, shrinkage cavities, and poor surface smoothness; although by adding benzoin These defects of powder coating can be obviously improved, but benzoin is easy to cause yellowing of powder coating, and when the powder coating is applied to porous substrates, the effect of benzoin is not ideal

Method used

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  • Porous substrate powder coating and preparation method thereof
  • Porous substrate powder coating and preparation method thereof
  • Porous substrate powder coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A powder coating for porous substrates, comprising the following components in parts by mass:

[0031]

[0032] Wherein, the defoamer contains the following components in parts by mass:

[0033] Benzoin 15 parts;

[0034] 5 parts of blocked polyisocyanate;

[0035] 5 parts of nonylphenol polyoxyethylene ether.

[0036] The defoamer made of a mixture of benzoin, blocked polyisocyanate and nonylphenol polyoxyethylene ether greatly improves the disadvantage of only using benzoin in the prior art; the blocked polyisocyanate introduced by the defoamer can participate in the system The reaction of residual hydroxyl groups in the system can prolong the gelation time of the system, reduce the melt viscosity, and increase the crosslinking density; the introduced nonylphenol polyoxyethylene ether can not only help wet the substrate, but also help reduce the melting of the system viscosity. Moreover, the proportion of the components in this embodiment makes the blocked poly...

Embodiment 2

[0039] A powder coating for porous substrates, comprising the following components in parts by mass:

[0040]

[0041] Wherein, the defoamer contains the following components in parts by mass:

[0042] Benzoin 10 parts;

[0043] 3 parts of blocked polyisocyanate;

[0044] 3 parts of nonylphenol polyoxyethylene ether.

[0045] The defoamer made of a mixture of benzoin, blocked polyisocyanate and nonylphenol polyoxyethylene ether greatly improves the disadvantage of only using benzoin in the prior art; the blocked polyisocyanate introduced by the defoamer can participate in the system The reaction of residual hydroxyl groups in the system can prolong the gelation time of the system, reduce the melt viscosity, and increase the crosslinking density; the introduced nonylphenol polyoxyethylene ether can not only help wet the substrate, but also help reduce the melting of the system viscosity. Moreover, the proportion of the components in this embodiment makes the blocked poly...

Embodiment 3

[0048] A powder coating for porous substrates, comprising the following components in parts by mass:

[0049]

[0050] Wherein, the defoamer contains the following components in parts by mass:

[0051] Benzoin 25 parts;

[0052] 7 parts of blocked polyisocyanate;

[0053] 7 parts of nonylphenol polyoxyethylene ether.

[0054] The defoamer made of a mixture of benzoin, blocked polyisocyanate and nonylphenol polyoxyethylene ether greatly improves the disadvantage of only using benzoin in the prior art; the blocked polyisocyanate introduced by the defoamer can participate in the system The reaction of residual hydroxyl groups in the system can prolong the gelation time of the system, reduce the melt viscosity, and increase the crosslinking density; the introduced nonylphenol polyoxyethylene ether can not only help wet the substrate, but also help reduce the melting of the system viscosity. Moreover, the proportion of the components in this example makes the blocked polyiso...

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Abstract

The invention discloses a porous substrate powder coating and a preparation method thereof. The powder coating is prepared from polyester resin, a curing agent, filler, titanium dioxide, a levelling agent, a defoaming agent, an adhesion promoter and a pigment. The defoaming agent in the porous substrate powder coating disclosed by the invention is a mixture of benzoin, closed isocyanate B1530 and nonylphenol polyoxyethylene ether, has higher crosslinking density and endows the power coating with low surface tension; the defects that small molecular substances in the coating or volatile matters adsorbed to the surface of a coated workpiece escape in the baking process to form needle holes, air holes and the like can be effectively overcome; in a porous workpiece coating process, defoaming and degassing effects of galvanized parts and cast aluminum parts are good; moreover, by the use of hydroxyl carboxyl-terminated polyester resin with a high acid value and the adhesion promoter, the power coating has a better adhesive force and is firmly combined with a porous substrate.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, and in particular relates to a porous substrate powder coating and a preparation method thereof. Background technique [0002] In order to reduce the emission of volatile organic compounds, powder coatings have become the development direction of the coatings industry at home and abroad, and are widely used in household appliances, automobile manufacturing, construction, and chemical pipelines. [0003] With the widespread application of powder coatings, some problems in the application of powder coatings in various fields have also been exposed, such as: powder coatings have poor leveling, pinholes, shrinkage cavities, and poor surface smoothness; although by adding benzoin These defects of powder coatings can be significantly improved, but benzoin is easy to cause yellowing of powder coatings, and when powder coatings are specifically applied to porous substrates, the effect of benzoin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D5/03C09D7/12C09D7/06C09D7/47
CPCC09D5/033C09D167/00C08L71/02C08K13/02C08K5/29C08K2003/2241C08K5/07
Inventor 王方银王峰张雪梅
Owner ANHUI MEIJIA NEW MATERIAL