SU1381144A1 - Method of producing dry redispersible paints - Google Patents

Abstract

This invention relates to the production of dry redispersible paints for painting and outdoor work capable of redispersing in an aqueous medium. The invention improves the resistance of the paint film to washability due to the fact that the method of obtaining dry paints is carried out by dispersing the pigment in an aqueous emulsion of dibutyl phthalate and a surfactant based on polyoxyethylene ethers of alkylphenols, followed by drying the resulting pigment paste at 90- 95 ° C to a residual moisture content of 4% and blending with dry polyvinyl acetate with a particle size of 10-200 microns. 2 tab. (L

Description

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This invention relates to methods for producing dry redispersible paints used for painting and for outdoor work, capable of redispersing in an aqueous medium to form a usable paint.

The aim of the invention is to increase the resistance of the ink film to washing.

Various white and color pigments (titanium dioxide, yellow cadmium, ultramarine, chromium dioxide, etc.) are used as pigments, depending on the desired color of the paint.

As dry polyvinylacetate (PVA), PVA with a particle size of 10–200 µm is used.

B Table 1 shows the granulometric composition of PVA, in Table 2 - the properties of the resulting paints.

Example 1 (white paint).

Titanium dioxide is mixed with water emulsion of dibutyl phthalate (DBP) in solution OP-10 in the following ratio,%:

Titanium dioxide 62.5

DBF6.25

OP-100.38

Water30,93

The batch is ground on the sprayer machine, dried at 90 ° C. Dry processed pigment is mixed in a ball mill with dry PVA with a particle size of 10 - 200 microns for 2-2.5 hours. The ratio of pigment: binder 1: 1. Water-washability of a paint film based on dry paint 1 h.

Example 2 (white paint).

Titanium dioxide is treated in the same ratios as in Example 1, and then the dry treated pigment is mixed in a ball mill with a dry PVA of a particle size distribution of 10-180 microns for 2-2.5 hours

The ratio of pigment: binder 1: 1,

Water resistivity of the paint obtained is 1 h.

Example 3 (white paint).

Titanium dioxide is treated in the same ratios as in Example 1. The treated pigment is mixed in a ball mill with a dry PVA with a particle size distribution of 10–300 µm for 2–2.5 hours.

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pigment: binder 1: 1. Water resistance of the paint obtained is 0.6 h. Example 4 (yellow paint). Cadmium yellow medium is kneaded with DBP emulsion in an OP-10 solution in the following ratio,.%: Light yellow cadmium96.2

Dibutyl phthalate 3,3 OP- Yu0,5

The treated mass is dried and mixed in a ball mill with a dry PVA of particle size 10 -200 microns for 2-2.5 hours

The ratio of pigments is 1: 1. Water washability of the resulting paint 1 hour

Example 5 (yellow paint).

Cadmium yellow medium is treated in the same way as in Example 4, and then mixed in a ball mill with a dry PVA with a particle size distribution of 10 -300 μm for 2-2.5 hours. Pigment: binder ratio 1: 1. Water resistivity of the resulting paint 0.5 hours

Example 6 (blue paint). Ultramarine blue is mixed with DBP emulsion in OP-10 racer in the following ratio,%:

Ultramarine93,2

DBF5,2

OP-101,6

The treatment is carried out in a ball mill at a pigment: ball ratio of 1: 2. The wet pigment mass is dried at 100-105 ° C, and then in a Werner mixer, mixed with dry PVA in a pigment: binder ratio of 1: 1. The granulometric composition of PVA 10 - 200 microns. Dissolve paint 1 h.

Example 7 (blue paint). Ultramarine blue is treated in the same manner as in Example 6, and then mixed in a Werner mixer with dry PVA in a pigment: binder ratio of 1: 1. Granulometric composition of PVA 10-300 microns. Water-washable paint 0.5 hours

Example 8 (green paint). Chromium dioxide is treated with DBP emulsion in OP-10 solution in the following ratio:

Chromium dioxide 96.2 DBP 3.3

OP-100,5

The treatment is first carried out in a Werner mixer, and then the mixture is passed through a dyeing machine, dried at 90-95 ° C and mixed in a ball mill with dry PVA in a pigment: binder 1: 1 ratio for 2-2.5 hours. Granulometric composition PVA 10-200 microns. Water-washable paint 1 hour

Example 9 (green paint),

Chromium dioxide is treated in the same way as in Example 8, and then mixed in a ball mill with a dry PVA of a particle size distribution of 10–300 µm in a pigment: binder ratio of 1: 1 for 2-2.5 hours. The paint is water-free , 6 h.

Example 10. Titanium dioxide is treated with emulsion DBP in solution OP-10 in the following ratio,%:

Titanium dioxide 92.5

DBF6.25

OP-103,8

Kneading fray in a ball mill, dried at 90 ° C. Dry processed pigment is mixed in a ball mill with dry PVA (particle size 10-250 microns) for 2-2.5 hours. Pigment: binder ratio 1: 1. The content of the fraction of 250 microns. Water resistivity of the paint obtained is 0.6 h.

Example II Cadmium yellow medium is mixed with DBP emulsion in OP-10 solution in the following ratio,%:

Cadmium yellow

bright96,2

DBF3,3

OP-100,5

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After mixing the components in a ball mill, the treated pigment is dried at 90 ° C and mixed in a ball mill with a dry PVA with a particle size distribution of 10-250 microns with a content of a fraction of 250 microns of 10%. Water resistivity of the paint obtained is 0.6 h.

Example 12. Ultramarine pigment is mixed with DBP emulsion in

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with 1 thief OP-10 in the following ratio-- NII,%:

Pigment93,2

DBF5,2

OP-101,6

The treatment is carried out in a ball mill, after which the paste is dried and mixed with dry PVA in a ratio of 1: 1: 1. The granulometric composition of dry PVA 10-250 microns. The content of the fraction of 250 microns 10%. Water resilience 0.6 hours

 and measure 13. Chromium dioxide is treated with DBP emulsion in OP-10 solution in the following ratio,%: Chromium dioxide 96.2 DBF3.3

OP-100,5

Kneading frayed on the dyeing machine. Then dry the treated pigment is mixed with dry PVA in a 1: 1 ratio. The granulometric composition of the powder is 10-250 microns. The content of the fraction 250 microns 5%. Water resilience 0.6 hours

Thus, in all the examples given, the content of a fraction of 250 μm, even in insignificant amounts (5%), leads to a decrease in water abundance.

Claims (1)

Invention Formula The method of obtaining dry redispersible dyes by dispersing the pigment in an aqueous emulsion of dibutyl phthalate and a surfactant based on polyoxyethylene ethers of alkylphenols, followed by drying pigment paste and blending with dry polyvinyl acetate, which is so good that they have a good blend strength and a blend with dry polyvinyl acetate. for washing, drying is carried out at 90. 95 ° C to a residual moisture content of 4% and polyvinyl acetate with a particle size of 10-200 µm is used as polyvinyl acetate. Note, examples 3,5,7,9 - control. Table I § ABOUT 00 about 00 about g about 00 00 about 1L P 1L P about 1L SP about fM 1L city) l cm o see 1L fM about 0 about I so 1L l cm sO go ABOUT - ABOUT so il about about so about - about rg f (N about P cm m cm about " go ABOUT - g 7 about st four 0 w ts about CS BUT about S -about oo see I " oo 1L "SI about cm o see about g about cm PC about rf about 1L | O About CTS about m " ABOUT ABOUT about G4 o see o see about go ABOUT go O in o four " about go I t 1L (N OO tM oh oh - about about cm - "" "about 1G1 cm about about g 1L . about about " about Ro  | L §S§ About 00 S Ltd HO G OE about Ltd  «« P m p about m about 1L I about t Oh oh - - about 1L about BUT "ABOUT "N" l um wn m about vO g If} 1L oh oh  about about fO - t about 00 GS (rj - (N L t § about o f §§ about csl (m I oo 1L - about CN about - about sh (N about vA oh oh about t about - vC r about "l I - (L Ltd 1Л 1Л Ш U-, N cm CSI about k P fo i Si