Waterborne composition for priming wood products

 

(57) Abstract:

Usage: coating wood for subsequent painting and varnishing in the manufacture of wood products household goods, such as toys, gifts, cookware, utensils. The inventive waterborne composition contains 50% aqueous polyvinyl acetate dispersion 0,11 0,12 h, starch 0.1 to 0.15 g, dibutyl phthalate or dibutylsebacate 0,008 0,01 h, water 1,29 1,31, Starch diluted with water. In the obtained suspension is injected water, brought to a boil while stirring. In starch paste enter pre-plasticized polyvinyl acetate dispersion. Characteristics properties: the rate of drying 12 h, non-toxic, good hiding power, no cracks, good adhesion. table 2.

The invention relates to compositions for priming, particularly, to a composition for priming wood products to create a coating for subsequent painting and varnishing.

The invention can be used in the manufacture of wood products household goods, mainly, toys, Souvenirs, etc. products.

Manufacturing of wood products includes primary processing on the ka is applied on the surface of various substances or their mixtures, solutions, suspensions, dispersions, i.e., auxiliary materials, processed giving them the wood surface properties required for subsequent finishing operations.

Such auxiliary materials include drying oils, fillers, primers, adhesives.

Requirements for these materials requirements are that they must be created on a wood surface layer coating, which ensures its quick drying, strength, good hiding power, no swelling, good adhesion to wood and coating lacquers, paints. Along with the above technological requirements to the materials used, the last in the manufacture of toys or similar goods household goods (Souvenirs, kitchen utensils, dishes, etc. must comply with sanitary and technical norms of health authorities to the materials included in the list permitted for use in food, etc. industries. In accordance with these requirements, it is preferable to use water-soluble dyes, adhesives vegetable origin, etc., environmentally friendly materials.

Known composition for priming wood (putty) on osiri cellulose) (0,1-1,0%), the dispersant (0.1 to 1.0%), emulsifier (0.5 to 2.0%), antiseptic (0,1-1,0%), glycol (1-6% ), white soot (5-30%) and water (rest) [1]

The known toxicity of the filler due to the use for it as emulsifier, dispersant and sensitizing additive white soot and other chemicals that are not always meet the sanitary and technical requirements for cultural and everyday wood products.

The closest in technical essence to the invention is known aqueous composition (varnish, soil), including aqueous polyvinyl acetate dispersion with a dry residue 40-65 88,5 was 99.4 wt. the plasticizer dibutyl phthalate 0.5 to 10.0 wt. and the target additive silicone fluid NGL-11 0.1 to 1.5 wt. [2]

Known composition due to the presence of silicone fluid also does not meet sanitary and technical norms and, in addition, does not provide the necessary quality of the coating.

The purpose of the invention to provide a non-toxic composition that meet sanitary and technical standards, providing durable and high-quality coating of wood without swelling after subsequent coating with dye and varnish, as well as maintaining transparency.

Atrevimiento dispersion, polyester plasticizer and water, contains as a polyester plasticizer dibutyl phthalate or dibutylsebacate and additionally starch in the following ratio, wt.h.

50% water

polyvinyl acetate dispersion of 0.11-0.12 Starch 01,-0,15

Dibutyl phthalate or dibutylsebacate 0,008-0,01 Water of 1.29 to 1.31

Waterborne composition for priming wood products prepared as follows.

The estimated amount of the starch is dissolved in the necessary quantity of water at a temperature of 205aboutC. Then, the obtained suspension is injected the rest of the water brought to the boil with continuous vigorous stirring. In the resulting starch paste enter the estimated amount of pre-plasticized with dibutyl phthalate or dibutylsebacate PVA-dispersion. Stirring is continued until a homogeneous plastic mass containing no lumps and fat inclusions. Testing the quality of the obtained composition is carried out by rubbing it with a gauze pad on the surface of a wooden product, followed by drying at room temperature and applied on the formed layer of water-soluble dyes. This is estimated opacity de the varnish nerazluchnye under the action of water dyes, as well as adhesion to the wood surface and water-soluble dyes.

Use of this composition for priming wood products as follows.

Of lime (mostly) die on a lathe grinds the workpiece product of a given shape and size according to the working sample. The workpiece is maintained not less than 5 days in a room at a temperature not lower than the 18aboutWith the humidity abs.12% If necessary, minor defects on the surface of the workpiece shpatljujut mixture of casein glue with a thickener talc, followed by drying for 4 hours at a temperature not lower than the 18aboutAnd polishing cloth. Then the workpiece is wiped with gauze or any soft cloth to remove wood dust and other contaminants and cover with water-based composition according to the invention, gauze swab. Depending on the wood species, the concentration of the components in a waterborne composition and other conditions of application of the composition for priming is conducted three times, with exposure to drying at a temperature not lower than the 18aboutC for at least 12 h, 6 h and 4 h after the first and subsequent coatings, respectively. Then the product of the product varnish (three-time coated), the product is dried to 36 h at 18aboutC.

It is recommended to use nail Polish brand PF-283 GOST 5470-75.

In table.1 and 2 shows examples illustrating the invention.

WATERBORNE COMPOSITION FOR PRIMING WOOD PRODUCTS, including a 50% aqueous polyvinyl acetate dispersion, a polyester plasticizer and water, characterized in that it contains as a polyester plasticizer dibutyl phthalate or dibutylsebacate and additionally starch with the following sootnoshenii, wt. h

50% aqueous polyvinyl acetate disperse 0,11 0,12

Starch 0,1 0,15

Dibutyl phthalate or dibutylsebacate 0,008 0,01

Water 1,29 1,31

 

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5 tbl, 13 ex

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