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Water emulsion coating and preparation method thereof

A technology of water-based latex and paint, applied in the direction of latex paint, coating, etc., can solve the problems of paint syneresis and affect the appearance of paint, and achieve good thixotropy effect

Inactive Publication Date: 2008-03-19
SHENZHEN OCEANPOWER NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the paint itself is concerned, the use of hydratable cellulose ethers and alkali-swellable emulsions to form a large volume limits flocculation, resulting in severe syneresis and delamination of the paint during storage and transportation, which affects the appearance of the paint.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] High PVC coating in styrene-acrylic emulsion (PVC=45%, solid NVW=60%)

[0033] Raw materials Parts by weight Remarks

[0034] water 18.85

[0035] Propylene Glycol 2.0

[0036] Dispersant with association (H-34) 1.5

[0037] Wetting agent (Hydropalant 436) 0.1

[0038] Preservative (Alex251) 0.15

[0039] Defoamer (FoamStar  A10) 0.3

[0040] PH regulator (AMP95) 0.1

[0041] Rutile titanium dioxide (R-706) 16.0 DuPont

[0042] Filler 1 (heavy calcium-1000 mesh) 5.0 Jiaoling Guangfu

[0043] Filler 2 (wollastonite-800 mesh) 5.0

[0044] Filler 3 (kaolin DB80) 5.0 Shanxi Jinyang

[0045] Packing 4 (BaSO4-250 mesh) 14.0 Xinji, Hebei

[0046] Styrene Acrylic Emulsion RS-998A 30.O

[0047] Coalescing agent (alcohol ester twelve) 1.5

[0048] Associative thickener HEUR (DSX3551) 0.55

[0049] Preparation:

[0050] 1. Grinding slurry preparation: leave about 4 parts of water in advance, put the remaining water and alcohol solvent into the dispersion tank, disp...

Embodiment 2

[0060] Embodiment 2 and list of traditional paint raw materials:

[0061] Example 2

[0062] Preparation method: with embodiment 1.

[0063] Embodiment 2 and traditional paint performance comparison:

[0064] (1) The paint viscosity performance is as follows: Embodiment 2 Traditional paint

[0065] Medium shear viscosity 100KU 97.4KU

[0066] Low shear (6 turns) viscosity 3500mpa, s 12500mpa, s

[0067] Thixotropy (TI) 3500 / 2400=1.46 12500 / 2400=5.21

[0068] (2) Comparison of particle distribution state and particle aggregation and flocculation state of coating effective film-forming matter in scanning electron microscope

[0069] Scanning conditions: after the paint was produced, it was stored at room temperature for 5 days, diluted with water, and the dilution ratio was: paint: water=1: 250, then observed under a 500-fold and 5000-fold electron microscope, the results were as follows: the coating of Example 2 under a 500-fold electron microscope ( All the en...

Embodiment 3

[0074] Embodiment 3: preparation of color paste, medium and high PVC system (20% emulsion, PVC=63%, solid NVW≥60%);

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PUM

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Abstract

The invention discloses an aqueous latex paint with high solid and low-viscosity, wherein the coating viscosity is regulated by associative thickeners, such as hydrophobic modified polyaminoester HEUR, hydrophobic modified Polyether HPE and / or hydrophobic modified alkaline expansive emulsion HASE, and the pigment and filler ground paint-pulp is dispersed by associative dispersants, and the moderate-high-low PVC aqueous latex paint used is 20-60 percent in total paint by weight of bonding emulsion. In the invention, the organic pigment and filler particle surface is modified by associative dispersant to enable the organic pigment and filler particle surface to be drawn into the thickening-network, so as to meet requires for lower shear viscosity of the coating and direct construction without dilution with water. The coating abandons conventional hydration thickening method, and all adopts associative thickeners to regulate the coating viscosity, so the coating has good low thixotropy; while the bonding latex particles and pigment and filler particle with function of fill and color are homogeneously distributed more ideally, therefore the coating has no layer phenomenon appeared which is caused by syneresis.

Description

【Technical field】 [0001] The invention relates to a water-based latex paint and a preparation method thereof, in particular to a high-solid low-viscosity water-based latex paint and a preparation method thereof. 【Background technique】 [0002] The coating industry puts forward requirements for the development of coating technology, requiring coatings to improve performance, reduce volatile matter, and reduce organic solvent emissions. Therefore, high-solid, 100% solid powder coatings, light-curing, and environmentally friendly water-based coatings are the development direction of the coatings industry. [0003] At present, the solid content of coatings formulated in the market is generally lower than 60%, even lower than the national standard requirement of 45%. The viscosity of the coating is too high. In order to meet the low viscosity requirements of construction, a large amount of water is added to further reduce the effective film-forming substances and reduce the thickn...

Claims

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Application Information

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IPC IPC(8): C09D5/02C09D7/12
Inventor 陈素平何唯平
Owner SHENZHEN OCEANPOWER NEW MATERIALS TECH
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