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Preparation method of polyacrylate levelling agent active matters for powdery paints

A technology of polyacrylates and acrylates, applied in powder coatings, coatings, etc., can solve the problems of insignificant dispersion and masking, improve recoating performance and appearance, anti-interference effect, and simplify the color change process. Effect

Active Publication Date: 2012-11-21
六安科瑞达新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion and masking effect of the existing leveling agent on the front color during the color change process is not significant, and the influence of the front color on the back color can only be eliminated by strict cleaning

Method used

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  • Preparation method of polyacrylate levelling agent active matters for powdery paints
  • Preparation method of polyacrylate levelling agent active matters for powdery paints
  • Preparation method of polyacrylate levelling agent active matters for powdery paints

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0028] Table 1

[0029]

[0030]

[0031] The reaction materials and proportioning ratio are shown in Table 1. Proceed as follows:

[0032] (1) In a four-neck flask with a reflux condenser, a thermometer, a stirrer, and a dropping funnel, add the reaction solvent, start the stirrer, fill with nitrogen for protection, and heat up to solvent reflux (about 80°C);

[0033] (2) under reflux temperature, mixed monomer and initiator 1 are added dropwise in the flask, and 6h is dripped;

[0034] (3) Initiator II is supplemented in the flask, 10min is added, and then insulation reflux reaction 1.5h;

[0035] (4) Continue to maintain reflux, add the modifier dropwise to the reactor, drop it for 2.5 hours, and then continue to insulate for 2.5 hours;

[0036] (5) Distill under reduced pressure to remove the solvent, discharge and cool to obtain the leveling agent active substance A, which has a number average molecular weight of 9400 and a calculated Tg value of about -54.0°C. ...

preparation Embodiment 2

[0038] Table 2

[0039]

[0040]

[0041] The reaction materials and proportioning ratio are shown in Table 2. Proceed as follows:

[0042] (1) In a four-necked flask with a reflux condenser, a thermometer, a stirrer, and a dropping funnel, add the reaction solvent, start the stirrer, fill with nitrogen for protection, and heat up to solvent reflux (about 150°C);

[0043] (2) under reflux temperature, mixed monomer and initiator 1 are added dropwise in the flask, and 2h drops completely;

[0044] (3) Initiator II is supplemented in the flask, 60min is added, and then insulation reflux reaction 0.5h;

[0045] (4) Continue to maintain reflux, add the modifier dropwise to the reactor, drop it for 0.5h, and then continue to insulate for 0.5h;

[0046] (5) The solvent was removed by distillation under reduced pressure, and the leveling agent active substance B was obtained by discharging and cooling. The number average molecular weight was 7600 after testing, and the calcu...

preparation Embodiment 3

[0048] table 3

[0049]

[0050] The reaction materials and proportioning ratio are shown in Table 3. Proceed as follows:

[0051] (1) In a four-neck flask with a reflux condenser, a thermometer, a stirrer, and a dropping funnel, add the reaction solvent, start the stirrer, fill with nitrogen for protection, and heat up to solvent reflux;

[0052] (2) under reflux temperature, mixed monomer and initiator 1 are added dropwise in the flask, and 3h is dripped;

[0053] (3) Initiator II is replenished in the flask, 30min has been added, then insulation reflux reaction 1h;

[0054] (4) Continue to maintain reflux, add the modifier dropwise to the reactor, drop it for 1h, and then continue to insulate for 2h;

[0055] (5) Distill under reduced pressure to remove the solvent, discharge and cool to obtain leveling agent active substance C, the number average molecular weight is 8100 after testing, and the calculated Tg value is about -51.3°C.

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Abstract

The invention, relating to the field of paint auxiliary agents, particularly relates to a preparation method of polyacrylate levelling agent active matters for powdery paints, comprising the following steps: polymerization of at least a hydroxy acrylate monomer and at least an acrylate monomer which contains no hydroxy and is not reacted with hydroxyl; and modification with an amino siloxane coupling agent. According to the invention, the levelling agent active matters disclosed herein are solid after being processed by fumed silica adsorption or polyester maternal dispersion, and can be directly applied in powdery paints for improving the adhesive force and appearance of the powdery paints; especially in the process of changing color, a small amount of previous colored powder can be uniformly dispersed to prevent the formation of variegated points or variegated pots in later color painting, the significant anti-interference effect is achieved, thus the color change of the powdery paints is greatly simplified; thus according to the levelling agent prepared by using the active matters, the adhesive force of the powdery paints on glass, metal and other substrates can be obviously improved.

Description

Technical field: [0001] The invention relates to the field of coating additives, in particular to a preparation method of a polyacrylate leveling agent active substance for powder coatings. Background technique: [0002] In the construction of powder coatings, as the coating cools to form a film, the surface tension of the coating film increases, and the viscosity increases, which makes the tension, viscosity and temperature of the bottom layer and the surface layer of the coating film different, so that the paint moves from the bottom layer to the surface layer, and the surface layer due to gravity Factors such as sinking, thus forming convection, resulting in irregular texture on the surface of the coating film, which is the phenomenon of orange peel. During the melt leveling process of the powder coating, a surface tension gradient is formed locally, the part with low surface tension expands to the part with high surface tension, and the part with high surface tension shr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/28C08F8/42C09D7/06C09D5/03C09D7/47
Inventor 鲍远志
Owner 六安科瑞达新型材料有限公司
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