DD153888A1 - BIOZIDE-EQUIPPED WAESSER DISPERSION PAINTINGS - Google Patents

Abstract

Biocide-treated aqueous emulsion paints based on polyacrylates, which provide the complex protection of wood, wood-based materials and wood-based combination products against wood-spoiling u. wood-destroying mushrooms u. atmospheric damage factors cause u. to ensure biocidal protection of the coatings and the paints are specified. They contain 10 to 42% polyacrylate and a mixture of 2 to 4% sodium pentachlorophenol or 0.25 to 0.75% Dichlofluanid and 1.2 to 2.2% boric acid and 1.4 to 2.9% borax. The paints can be used as glaze or as inlet base.

Description

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Title of the invention

Biocide-treated aqueous dispersion paints

Field of application of the invention

The invention relates to biocidal aqueous polyacrylates dispersing dispersants for the complex protection of wood, wood-based materials and wood combination materials against all biological and atmospheric damage factors.

Characteristic of the known technical solutions

Wood-protective transparent paints are known which provide pore-open, specially adapted to the water vapor exchange of wood paints. Due to the content of biocides, they ensure the protection of wood, have favorable 'weathering properties and emphasize the natural wood structure decorative in transparent Pigaentierung.

The use of aqueous polyacrylate emulsion paints for wood and wood-based materials is also known. These translucent or opaque coatings provide particular benefit and convenience for their film properties and ease of use, including health, labor, fire, and environmental requirements.

A disadvantage of the polyacrylate dispersion paints, however, is that they are subject to rapid microbial spoilage on storage and the resulting paint film is susceptible to colonizing fungi and does not form a protective film against wood-destroying fungi.

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Another deficiency is that the aqueous dispersions have severe corrosion phenomena on existing ironworks materials, e.g. Fogging or fasteners, with the polings of the discoloration of the wood or the paint to cause damage to the coating.

Pur the combined task of wood preservation and painting

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The preservation of aqueous polyacrylate dispersion paints is not suitable for the biocides which are particularly suitable because of their combined effectiveness against wood-damaging fungi and for spoiling the paints.

Dichlofluanid hydrolyzes under alkaline conditions and is therefore not suitable for the alkaline polyacrylate dispersions.

Organotin compounds are only slightly resistant to light and are therefore not suitable for exterior coatings.

Water-soluble boron salts are only compatible with emulsion paints and are less promising because of their water solubility in weather-exposed coatings.

Organo-mercury compounds are excreted from a humane toxic point of view, as well as pentachlorophenol sodium, since it was only found to be effective in high concentrations of at least 5 % based on the total mass. The chlorophenols are also considered unsuitable because they often lead to discoloration of paints. The electrolyte sensitivity of the polyacrylate is a principal obstacle to the incorporation of polar water-soluble biocides. Pure wood preservation is known that sodium pentachlorophenol is not suitable for protection against wood-destroying basidiomycetes due to its pixation on the wood surface by ion exchange reaction and the lack of depth.

Borsalze, in contrast, have no effect against the wood-staining fungi. A combination of borax with sodium pentachlorophenol is due to the water solubility only for the

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Temporary protection against wood-discolouring fungi is considered suitable during the drying of the selected wood · Due to its water-solubility, the use of boron salts is only permitted for the protection of wood under roof.

Object of the invention

The object of the invention is to improve the wood protection and the storage stability and to reduce the iron corrosion.

Explanation of the essence of the invention

The object of the invention is to provide an aqueous polyacrylate dispersion which ensures comprehensive protection of the wood against all biotic and abiotic damaging factors as well as a biocidal protection of the paint and the paint films, but also retains the advantageous properties of Polyacrylatdispersionsanstrichstoffe.

According to the invention, the object is achieved by a paint based on aqueous polyacrylate dispersions having a polyacrylic content of

10 to 42%, as fungicides. ·

2.0 to 4.0 % NaPCP or

0.25 to 0.75 % dichlofluanid,

1.2 to 2.2 % boric acid and

Contains 1.4 to 2.9 % borax in the mixture.

The paints according to the invention can be applied by brushing, spraying or dipping. They can also be glazed pigmented and, applied in several layers, be used as a translucent paint. With the order as an inlet base and a second application of opaque pigmented dispersions and a further topcoat, a e.g. obtained by dipping process paint system can be achieved on wood, which has excellent protection properties.

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Another, not to be expected advantage is that these fungicidally treated dispersions neither lead to discoloration of the wood nor to corrosion on any existing iron materials.

The paints of the invention can be prepared in concentrated form and stably stored and diluted at the processing site to the application concentration with water,

embodiments

example 1

39.6 parts by weight Polyacrylatdispersion 42%

44.7 "" distilled water

4.0 "" boric acid-borax mixture 1: 1

2.0 "» ethyl glycol ·.

0.4 "" defoamer

9.3 "" PCPNa 37% alcoholic solution

The components are mixed in succession with a high-speed stirrer in the polyacrylate dispersion.

Into this stock solution are stirred 7 mass of yellow oxide red paste. The pigmented stock solution is diluted with 1 part by weight of water to 3 parts by weight stock solution and applied by brush or by dipping in two stages with intermediate drying on test specimens of pine sapwood. The specimens are subjected to the attack of wood-destroying fungi in collaeulas without stress as well as after combined stress by 90-hour water storage and 300-hour UV irradiation. The dipped specimens of

3 1.5 x 2.5 x 5 cm were over three months the attack of Coniophora puteana and the coated specimens with a

ρ 4 × 5 × 4.5 cm upper surface subjected to the attack of Pullaria pullulans for four weeks.

The blue growth is from a minimum expenditure mass of

2 100 g / m of wooden surface without using the paint

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and 200 g / m with stress as well as a wood destruction by Coniophora puteäna from 150 g / m without and 200 g / m with stress completely prevented.

These required for the permanent protection of the wood effort masses of woodscaützendem paint are experienced in practice with ease on the wood on

zuormgen. Wt. • Example 2 II 39.6 ti parts 53.0 H Il 1.3 11 It 2.2 ti Il 2.0 Il It 0.4 Il 1.0 It

polyacrylate

distilled water

boric acid

borax

ethyl glycol

defoamers

Susceptible Dichlofluanidzubereitung 50 % ± g

The components are mixed successively with a high speed stirrer.

This paint, which can be used, is applied in 1 to 3 full coats to a pine wood panel with a coating weight of 200 to 400 g / m, which has been exposed to the weather for one year in a vertical position, facing the test side to the south. In contrast to the heavily stained, untreated control surface, the coated surfaces show no visible involvement by wood-discolouring fungi. The paint gives the wood a dull shine, which underlines the natural wood structure. The color tone is unchanged after one year, and the paint film shows no delamination by flaking.

2λ 1 c 7 1 ί ID / I

Example 3

The ready-to-use paints after. Examples 1 and 2 are applied with zvjei operations saturated, with intermediate drying, on all sides on pine boards with high sapwood content with the brush. These boards were exposed in a sponge cellar in plastic tubs on Piaflor and cultivation boards the practice-relevant attack of wood-destroying fungus Serpula lacrimans and found after a Binvjirkdauer of one year following mass loss of the specimens as a measure of the fungus attack;

test material

Untreated pine wood Polyacrylate dispersion without additives Inventive paint

Example 4

Acrylatdispersionseinlaßgrund

39.6 parts by weight of polyacrylate dispersion 42 #ig

44.7 "" distilled water

4.0 "" boric acid-borax mixture 1: 1

Pentachlorophenol sodium solution 37 % ± g

ethyl glycol

defoamers

The preparation is carried out so that all substances are added in order and with stirring by means of a high speed stirrer.

Acrylic dispersion pre-coat paint 14.00 parts by weight of distilled water

example 1 example 39 Mass loss % 42 40 0 42 0

9.3 ti ti 2.0 11 It 0.4 11 11

15.00 II 11 polyacrylate 0.08 Il Il Na tripolyphosphate 0.20 It 11 ammonia 3.00 ti M PentachlorphenoInatrium solution 0.40 tt H stabilizer 0.20 It M Lecithin solution

weight . Parts Hikrotalkua. Il Il Chalk (Microtherm) ! I ti Titanium dioxide (Hutu) Il Il defoamers

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The distilled water is initially introduced, then binder (polyacrylate dispersion) is added and the auxiliaries, including the pentachlorophenol sodium solution, are added slowly in succession with stirring and distributed well with stirring.

13.00 10.00 11.00 0.40

The pigments and the defoamer are added to the above solution with stirring and then rubbed on the Perl mill. After rubbing, the addition of 32.72 parts by weight of polyacrylic latdiscrionion takes place.

Alkyd Tauchlackiarbe

19.60 parts by weight of titanium dioxide (rutile)

0.27 "" Co -)

0.43 "" Pb ") siccative

0.41 "" Ca -)

0.60 "" dispersing aid

1.10 "" skin contraceptive

2.10 "" Bentone paste

75.49 "" Alkyd resin 50 % lg

The dispersion is best done on a Perl mill.

Test pieces of pinewood (sapwood) of 1.5 x 2.5 x 5 cm were each dipped for one minute in succession with intermediate drying in the inlet base, the primer coat and the topcoat. After a period of irrigation of 90 hours, the specimens in collae dishes were exposed to the attack of the wood destroying fungus Coniophora puteana for three months as compared to untreated wood and a comparative test specimen containing no fungicide additives. The following fungal growth was determined:

Coating system according to the invention = 0 Comparison coating system without biocides = 4 Untreated wood. = 4

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Rating: O = no vegetation • 1 = low growth 2 - medium growth 3 - strong growth 4 = very strong growth Example 5

A commercially available acrylate dispersion was mixed in various approaches with increasing levels of single biocide and biocide mixtures, which were previously dissolved in water. It was then diluted with water to the extent that 10 parts by weight of acrylate dispersion accounted for 20 parts by weight of water. In these inlet primers, test pieces of pine sapwood of 1.5 × 2.5 × 5 cm were immersed once in this inlet primer for ten seconds. These specimens were exposed in Kolleschalen over three months to the attack of the wood-destroying fungi Coniophora puteana and Gloephyllum trabeum. The mass losses occurred by the mushroom attack reached the following values:

Biocides in the uptake acrylate mass dispersion-Sinlaßsrund _o % " g / πΓ

Mass loss % Coniophora puteana Gloephyllum trabeum Test Control Test Control Body test body Body test body

6.0 NaPCP 18.5

5.0 NaPCP 206

4.0 NaPCP 201

3.0 NaPCP 193

3.0 NaPCP 200

1.4 boric acid 1.6 borax

2.5 NaPCP 189 1.4 boric acid

1.6 Borax

2.0 NaPCP 170 1.4 boric acid 1.6 borax

5.3 16.6

40.8 43.3 41.2 40.0

34.0

39.3

47.8

8.9

2.9

12.9

15.4

0.8

1.0

0.3

37.3 39.0

39.3 36.8

34.6

33.8

31.9

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In a second series, specimens of 5.3 x 6.5 x 1.2 cm of pine sapwood were placed in the inlet primers for ten seconds

immersed, cut to 4.4 x 4.6 x 0.9 cm to expose attack surfaces and exposed in Kolleschalen the attack of the wood-staining Blueuepilzes Pullularia pullulans. After four v / o c lie η the following bluish infestation was observed on the wood surface to be painted:

Biocides in the bluebane

dispersion test body control test body

intake reason

6.0 NaPCP 0 2

5.0 NaPCP 1 "2

4.0 NaPCP 1 2

3.0 NaPCP 1 2

3.0 NaPCP 0 2

1.4 boric acid 1.6 borax

2.5 NaPCP 0 2 1.4 boric acid

1.6 Borax

2.0 NaPCP 0 '2

1.4 boric acid 1.6 borax

0 = no visible blue

1 = translucent 31ae -

2 = surface fully overgrown

Example 6

An acrylate dispersion containing 42 % of the body of the plague was admixed with 2 ", 6 % NaPCP, 1.4 % boric acid and 1.6 % borax, after the substances had previously been dissolved individually in water, then diluted with water to reach 10. Parts by weight of acrylate dispersion 20 parts by weight of water are omitted In this fungicidal inlet primer, specimens of pine sapwood of 1.5 × 2.5 × 5 cm were immersed for 1 χ 30 s or 2 χ 30 s with intermediate drying

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The other half was additionally submerged in an alkyd resin topcoat for 20 days, leached in water and then subjected to the fungal attack. The diluted acrylate dispersion without biocide additive was used for comparison with the same application technique and treatment checked. As a measure of the fungus attack, the following weight losses of the wood were determined:

dip painting

Mass without utilization acrylate acrylate without disp. disp. Anmit without mark biocide biocide

Losses %

with utilization acrylate acrylate without disp. disp. Anmit without mark biocide biocide

1 χ 30 s 1.0 30.5 36.6 5.4 25.3 32.3 0.6 33.0 35.9 5.4 26.8 29.4 kl 36.6 34 _ι? 9 24.7 ^ l 0.7 33.4 35.8 6.8 25.6 31.9 2 χ 30 s 0.2 35.7 35.8 0.5 28.7 32.1 - 0.4 35.3 26.1 0.8 29.0 22.5 0.4 31.6 29.5 2 A, 9 27 > 7 OTJ 34.2 30.5 0.8 27.5 30 ', 8 1 χ 30 s 0 14.5 25.7 0 17.0 32.2 and 1 χ 30 s 0 9.3 35.2 0 17.4 31.0 Alkyd resin dip paint 0 - M 0 "ö ~ SK

Example 7.

Acrylate dispersion inlet base according to Example 4 was constantly stirred in an open 2 liter beaker. Uncoated deep-drawn sheets (ST TZ HB-A 2) (0.8 mm thick, 40 mm wide) were immersed in the liquid phase. After six weeks of loading, the test panels showed no signs of corrosion.

Uncoated deep-drawn sheets were likewise immersed in a comparative batch of polyacrylate dispersion seed soil without biocide additive. After just one day of stress, the first corrosion phenomena appeared on the test panels, and two weeks later, the panels showed severe rust formation.

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Example 8

Acrylate dispersion primer paint according to Example 4 were added to determine the infection loadability at certain time intervals None and found after a contact time, the surviving microorganisms by germ count. Even after a three-time inoculation cycle, a clear sterility was found.

Acrylate dispersion master paints without preservative additive showed no sterility even after a short storage time or after the first inoculation.

Claims (2)

22 15 71 invention claim Biocide-treated aqueous dispersion paints for the complex protection of wood, wood-based materials and wood combination materials against wood-discoloring and wood-destroying fungi and atmospheric damage factors, based on polyacrylates, additives and excipients and optionally pigments, characterized in that 10 to 42 % polyacrylate-containing paint Mixture of 2.0 to 4.0 % sodium pentachlorophenol or 0.25 to 0.7.5 % dichlorofluanid with
1.2 to 2.2 % boric acid and
1.4 to 2.9. % Borax contains.