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Solvent-type high-solid paint containing rheologically modified resin

A rheology-modified resin and high solid content technology, applied in polyester coatings, coatings, etc., can solve problems such as difficult control, slow reaction speed, unstable fineness and thixotropic performance, and achieve easy resin preparation , The preparation process is simple and the effect of construction is convenient

Inactive Publication Date: 2004-11-10
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process, because the reaction of primary amine and isocyanate in the solvent is too fast, even if the reaction is controlled at low temperature, it is still difficult to control the particle size of the polyurea obtained. When melted and dispersed in the base resin, the fineness of the resin containing the sagging control agent is often not ideal; the second is to mix the amine compound with the base resin, the curing agent and the polyisocyanate compound, and then mix the two mixtures Resins containing sag control agents are prepared by reacting amines with polyisocyanates by mixing with vigorous agitation
Although the reaction speed can be slightly slowed down by this method, it is still not easy to control, so the obtained resin containing the sagging control agent is often unstable in fineness and thixotropic properties.
Therefore, the appearance (such as leveling, gloss) and mechanical properties of the solvent-based high-solid coatings formulated with the above-mentioned resin containing sagging control agent still cannot meet the needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] (1) Preparation of base resin

[0029] 1. Polyester resin (PE-1)

[0030] In a four-neck flask equipped with stirring, thermometer, water separator, fractionating column, and inert gas inlet, add 56.9 g of trimethylolpropane, 84.4 g of neopentyl glycol monohydroxypivalate, 67.0 g of phthalic anhydride, and 52.7 g of diacid, 21.6 g of glycidyl tert-carbonate (Cardura E-10, Shell Chemicals), 21.9 g of benzoic acid, and 45 g of xylene. Pass an inert gas, slowly raise the temperature under its protection, add 0.1g of dibutyltin oxide to 120°C, continue to raise the temperature and reflux reaction, raise the temperature to 220°C in 4 to 5 hours, and keep it at this temperature for 2 to 3 hours, Reaction until the acid value is less than 10mgKOH / g is the end point, cool down to below 180°C and vacuumize to remove residual water and small molecule alcohols, continue to cool down to below 140°C, add 80g of xylene and 30g of butyl acetate. Gained resin solid content: 70%, visc...

example 1

[0059] (1) Example 1 (used as intermediate paint)

[0060] 1. See Table 1 for the formula

[0061] Coating components

Dosage (g)

main film former

Base resin CA-1, solid content 70%

Cross-linked resin 582-2, solid content 60%

Rheology modified resin RCRCA-1, solid content 60%

45.00(45％)

35.00(30％)

29.17(25％)

Pigments

Titanium dioxide R-902 (manufactured by DuPont)

Talc powder 1250 mesh

Kaolin 1250 mesh

Precipitated barium sulfate 1250 mesh

Bentonite 1250 mesh

49.00

7.00

7.00

7.00

0.70

Auxiliary

Leveling agent EFKA-777 (manufactured by Efka)

0.28

[0062] Note: a. The formula does not contain auxiliary film-forming substances;

[0063] B, the number in brackets in Table 1 represents the percentage in the total weight of the main film-forming material solids;

[0064] c. In the formulation of Table 1, the ratio of pigment and filler to the main fi...

example 2

[0071] (2) Example 2 (used as a natural finish)

[0072] 1. Formula see Table 2

[0073] Coating components

Dosage (g)

main film former

Base resin PE-2, solid content 70%

Cross-linked resin 582-2, solid content 60%

Rheology modified resin RCRPE-2, solid content 60%

83.57(45％)

65.00(30％)

54.17(25％)

Pigments

Titanium dioxide R-902 (manufactured by DuPont)

Fumed silica R-972 (manufactured by Digoza Corporation)

70.00

0.35

Auxiliary

Leveling agent BYK-320 (manufactured by BYK)

0.52

[0074] Note: a. This formula does not contain auxiliary film-forming substances;

[0075] b. The numbers in brackets in Table 2 represent the percentage of the total weight of the main film-forming material solids

[0076] number;

[0077] c. In the formulation of Table 2, the ratio of pigment and filler to the main film former is 35:65 (by solid weight);

[0078]d. In the formu...

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Abstract

A solvent-type high-solid paint containing rheologically modifying resin features that its main filming substance is prepared from base resin (30-65%), cross-linking resin (15-40%) and rheologically modifying resin (20-40%) which is prepared from the solution of diisocyanate and the solution of amine compound through adding them to the base resin, reacting at 0-80 deg.C for 0.5-4 hr while stirring, and holding the temp. for 0.5-1 hr. The paint containing this modifying resin has advantages of thixstropy, and uniform coated layer.

Description

technical field [0001] The invention relates to a solvent type high solid content paint containing rheology modified resin. Background technique [0002] In recent years, people's awareness of environmental protection has been continuously improved, and the coating industry is increasingly inclined to use coatings with low volatile organic compounds (VOC), such as high-solid coatings, water-based coatings, powder coatings, and radiation-cured coatings. Solvent-based high-solid coatings are the most widely used in the intermediate coating and top coating systems involved in vehicle and general industrial coating. etc. have many irreplaceable advantages. The molecular weight and viscosity of film-formers of high-solid coatings are much smaller than those of ordinary paints of the same type. During construction, only a small amount of solvent can be added to achieve the construction viscosity. The organic matter in the water is greatly reduced, the pollution to the environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/00C09D133/00C09D167/00
Inventor 李大鸣王利群金加洪
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST