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Modified polyester powder paint and preparation method thereof

A technology of modified polyester and powder coatings, applied in powder coatings, polyester coatings, coatings, etc., which can solve the problems of gas removal, poor degassing effect, and weak degassing effect, so as to reduce air bubbles and improve production efficiency. Membrane effect, effect of increasing compatibility

Active Publication Date: 2019-05-28
余姚市亚宇工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Benzoin is widely used in general powder coatings, but it is easy to change color at high temperature, and its degassing effect is weak. For the above-mentioned castings and other workpieces, its degassing effect is poor, and it is difficult to timely and effectively enter the inside of the substrate into the molten coating. After removing the gas in the coating, there are still significant defects such as bubbles, shrinkage cavities, and particles in the coating.

Method used

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  • Modified polyester powder paint and preparation method thereof
  • Modified polyester powder paint and preparation method thereof
  • Modified polyester powder paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of modified polyester powder coating, comprising the following steps:

[0043] ①. Dissolve 2kg of dopamine hydrochloride powder in 2kg of deionized water, adjust the pH of the solution to 8.0 with 1M Tris buffer, and slowly stir for 2 hours at a stirring speed of 30r / min. Stand still for 68h to make viscose liquid containing polydopamine;

[0044] 2. Take by weighing 55kg of PBT and melt to obtain a polyester melt;

[0045] ③. Electrostatic co-spinning technology is used to coat the polyester melt and viscose liquid, so that the viscose liquid is coated on the outside of the polyester melt, and dried at a temperature of 80°C for 30 minutes, so that the water is evaporated to dryness to obtain a modified polyester fiber;

[0046] ④. Mix the modified polyester fiber obtained in step ③, 2kg of TGIC, 2kg of T105M, 1kg of GLP505, 2kg of benzoin, 30kg of nano-calcium carbonate and 0.5kg of color masterbatch, and then put them into the twin-screw extrude...

Embodiment 2- Embodiment 8

[0049] Embodiment 2-Embodiment 8 are all based on the method of Embodiment 1, the components and the content of the components are adjusted, and the specific adjustment parameters are shown in Table 1 below.

[0050] Raw materials and preparation parameters of the modified polyester powder coating of table 1 embodiment 1-embodiment 8

[0051]

[0052]

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Abstract

The invention belongs to the technical field of paint, and particularly relates to modified polyester powder paint and a preparation method thereof. The modified polyester powder paint is prepared from the following ingredients in parts by weight: 55 to 65 parts of polyester resin, 4 to 8 parts of curing agents, 0.5 to 2 parts of leveling agents, 0.5 to 2 parts of benzoin, 2 to 5 parts of polydopamine and 30 to 40 parts of filling materials through viscose preparation, polyester resin melting, electrostatic cospinning, extrusion molding granulation and crushing sieving. Bubbles, shrinkage holes and particles on the coating can be effectively reduced; good film forming performance, weather resistant performance, luster degree and adhesion power are realized.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a modified polyester powder coating and a preparation method thereof. Background technique [0002] Powder coatings have been widely used and developed at home and abroad. In powder coating, some workpieces often have obvious bubbles and shrinkage on the surface of the coating due to problems such as pores in the substrate (such as castings, hot-rolled plates, etc.). Holes, pinholes or particles seriously damage the decorative and aesthetic effect of the coating surface, and even endanger the anti-corrosion life of the coating. [0003] Benzoin, also known as benzoin (commonly known as benzoin), is a commonly used degassing agent in powder coatings. It is a white or light yellow odorless crystal with a melting point of 133-137°C. Benzoin is widely used in general powder coatings, but it is easy to change color at high temperature, and its degassing effect is weak. For the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/02C09D5/03C09D7/65C09D7/61C09D7/63
Inventor 周永良
Owner 余姚市亚宇工贸有限公司
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