FI56943C - FOERFARANDE FOER FRAMSTAELLNING AV ETT DIMENSIONSSTABILT PLANT ALSTER - Google Patents

Description

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Germany, Germany, Germany, the former Yugoslav Republic of Germany (DE) P 2132925-9 "(71) Glasurit-Werke M .. Winkelmann GmbH, Am Neumarkt 30, Hamburg-Wandsbek,

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Gunther Schwarz, Hiltrup, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7 * 0 Oy Kolster Ab (5lt)

The invention relates to a method for producing a dimensionally retaining, planar product consisting of a cellulosic base material, one side of which is provided with a moisture-impermeable surface layer, the other side of which is impregnated with silicone oils and dried.

Planar products of cellulosic material do not retain their dimensions as soon as they are unilaterally coated, i.e., these working materials twist or twist, planar materials curve or twist more or less depending on the thickness of the plate. Thus, paper webs, cardboard, hardboard or volcanic fiberboard made of wood chips or other cellulosic material, which are unilaterally coated, have the detrimental property that they always twist to varying degrees according to the moisture content. This harmful, undesirable phenomenon makes it difficult in most cases, for example, to use, handle and make full use of adhesive tapes, emery paper or adhesive papers and not self-adhesive films or self-adhesive wall papers. Hardboard made of wood or cellulose pulp is used in the furniture industry, for caravans and caravan interiors. In addition, they can be used as structural components in prefabricated house structures. Also, the fastening methods used in construction, such as gluing, stapling or nailing, become unilaterally coated as the shape of the hard fiber boards has become more expensive and costly without any guarantee of their durability. The only possible measure against twisting so far has been to coat such sheets or papers symmetrically on both sides in the same way. However, this is hardly ever possible in practice.

This object was surprisingly solved by a process for the preparation of dimensionally preserved, coated planar cellulosic materials, characterized in that these silicone oils are applied in a solution of 3 to 10% by weight, in organic hydrophilic solvents or in a solvent containing at least 10% by weight of hydrophilic solvents.

The silicone solution is applied immediately before or after unilateral coating and cured before or after rewetting the working material.

By dimensional stability within the scope of this invention is meant that the working materials of the cellulosic materials do not twist or twist, that they do not bend, bend or twist in a twist or in any other way as soon as they are unilaterally coated.

Simply undergo a structural material of the uncoated side of the after-treatment according to the invention resulted in surprisingly normally present epämuotou-tumisilmiön complete and permanent off retirement. Rather, an increase in distortion or deflection would have been expected because silicone oils as lubricants and smoothing agents can affect the intrinsic properties of the porous cellulosic working material as plasticizers and thus increase the coating distortion caused by the coating.

Unilaterally coated working materials, such as abrasive belts, emery papers and sandwich papers, as well as hard fiber boards, retain their shape when made by the method according to the invention and could be used and modified substantially more easily and without interference. Storage experiments under different conditions and over longer periods of time also showed that the dimensions of the coated working materials remained constant without any other distortions and changes in the untreated, unilaterally coated working materials. In addition, it was found that e.g. the surface becomes substantially smoother and smoother.

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Suitable silicone oils include methyl, methyl poly, methyl phenyl and methylphenyl polysiloxane, where turbid or various types of organo-substituents may be present, such as products having ethyl and methyl hydrogen groups as well as organic reactive groups such as e.g. cyanoethyl. N, N-cyanopropyl, N-trifluoropropyl, E-aminobutyl and tetrachlorophenyl. Silicone oils are obtained by known methods by hydrolysis of chlorosilanes, followed by condensation or polymerization to cyclic or straight polysiloxanes. Silicone oils are clear, colorless, neutral and almost odorless liquids with a viscosity of between 0.65 and 1,000,000 centistokes and a molecular weight of between 600 and 100,000. These compounds are described in more detail in the professional literature. Mention should be made here of the book "Einfuhrung in die Chemie der Silikone", Eugene G. Rochow, Verlag Chemie GnbH, Weinheim Bergstrasse, 1952 and "Ullmanns Encyklopädie der technischen Chemie ,, f Bd. 15, 196U, pages 778-702.

Silicone oils are soluble in many organic solvents such as aliphatic hydrocarbons, aromatic hydrocarbons, esters, further dimethyl sulfoxide, dimethylformamide. Particularly preferred solvents are hydrophilic solvents such as alcohols, especially ethyl, propyl, butyl, iso-propyl, isobutyl alcohol, further glycols, glycol esters, glycol ethers and glycerin. Examples are methyl, ethyl, butyl, isobutyl, propyl, amyl glycol, methyl glycol ester, ethyl glycol ester, butyl glycol ester, methyl glycol acetate, ethyl glycol acetate, ethylene glycol, butylene glycol, propylene glycol, propylene glycol. The solvents can be used alone or mixed together.

The application of the silicone oil solution to the uncoated side of the working medium takes place by conventional methods, such as, for example, brushing, pouring, spraying or a roller.

The process according to the invention can be applied to all working materials made of cellulosic materials which are unilaterally coated. By cellulosic material-containing working materials is meant all working materials which contain a cellulosic material on the surface of the working material. The working materials can be of any shape, but planar working materials are preferred, such as sheets, plates, films, which can be straight or bent. Suitable working materials include cardboard, papers, cellulosic films, hard fiber boards, laminated boards, plywood boards and volcanic fiber.

The working materials are unilaterally coated, i.e. they are covered with a cured layer which separates the working material from the cellulosic material from the airtight ambient atmosphere. Thus, it may inhalation of cellulosic material, as well as a variety of atmospheric humidity, the moisture exchange take place only through the uncoated side.

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The cellulosic material may be coated with materials unilaterally in any layer which ensures air-tight this aspect of the isolation of the ambient atmosphere. These layers can be inorganic or organic in nature. Thus, these include synthetic resins such as urea-formaldehyde, melamine-formaldehyde or phenol-formaldehyde resins, alkyd resins, polyester resins, polyamide resins, epoxy compounds, polyurethanes, polysulfides, polybutadiene, polyethylene, polyethylene, polyethylene, polyethylene.

Dyes, hard powders of different roughness, as well as pigments such as emery, quartz sand, glass powder, carbides, silicon carbide, pumice, aluminas, diatomaceous earth, polishes, etc. can be further mixed into the synthetic resins.

The coating may further be an inorganic substance, e.g. water glass.

The manufacture of such coatings is not the subject of this application.

This can be done in a known manner by means of rollers, by spraying or calendering the coating agent from solutions in organic solvents or from aqueous dispersions; it is also possible to coat with a finished film. It can then be dried and cured in the usual way. Curing is omitted when making self-adhesive films. After higher temperatures usually occur coated side of the curing agent comprises a cellulosic working medium still small amounts of moisture. To achieve equilibrium with humidity, at the end of the curing process, re-wetting usually takes place by spraying water on the uncoated side.

When using the method according to the invention, in this case the silicone oil solution is applied before or after the curing process and before or after rewetting.

Unilaterally coated working materials treated by the process of the invention are needed for a variety of applications. Thus, in particular, abrasive papers and abrasive belts can be produced in a dimensionally preserved form;

The following examples illustrate the method of the invention but do not limit it in any way. All $ figures given are calculated as percentages by weight. All parts are by weight.

Example 1

Abrasive belt unilaterally coated with phenolic resin and conventional abrasives is treated on the uncoated side with a solution of 5,56943 of 5 parts by weight of silicone oil based on phenylmethylsiloxane in butyl glycol »It is applied by means of a roller 10-15. After the solvent has been removed and drying has taken place, a smooth, even, untwisted abrasive belt is obtained which retains its shape permanently.

Example 2

The back of the hard fiber board coated on one side with an acid-curable lacquer layer of 50 to 100 microns is treated by rolling a solution of 6 parts of silicone oil based on methylpolysiloxane in a mixture of butyl glycol and glycerin (80:20). It is added at 15-17 g / m 2. A hard fiber board is obtained which retains its uniform shape and does not twist even in very high humidity.

Example 3

A solution of 5 parts by weight of silicone oil in a mixture of 60 parts of toluene, 15 parts of monoglycol butyl ether and 15 parts of monoglycol butyl ether is sprayed on the uncoated side of a paper web coated with a phenolic resin embedded in emery and having a thickness of 1.2 mm. , so that its strength becomes 15-1T g / m. After drying for 10 hours in an oven at 60 ° C, the dimensional stability remained unchanged after 6 weeks of storage at 80% relative humidity, whereas a similar sample treated only with solvent mixture without silicone oil in the same way was highly distorted after a short storage.

Example U

Immediately after firing the epoxy layer, a solution of silicone oil in a mixture of 90% test benzine and 10% butanol is rolled onto the back surface of a hardboard with an epoxy coating. After air drying, water is sprayed on the uncoated back surface. The silicone oil solution was applied approx.

- 2 1¾ g / m. The hard fiber board thus obtained retains its smooth, dimensionally retaining shape and shows no tendency to curve.

Example 5

Unilaterally coated papers, such as stamps or wallpapers coated with an adhesive film, are treated on the uncoated side by brushing a) before applying the adhesive, b) simultaneously with the application of the adhesive, or c) after applying the adhesive with 8% silicone oil. with a solution based on the sounds of methylpolysyl in butylidene glycol. The amount of silicone oil solution applied depends on the weight of the paper and the density of the paper and is on average between 5 ~ 30 g / m 2. After drying, glued papers (stamps or wallpaper) are obtained which no longer curl or twist.

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Example 6

A self-adhesive base or decorative film in which the flap is paper impregnated with urea-formaldehyde or melamine-formaldehyde or phenol-formaldehyde resins and the self-adhesive layer is a melamine or urea resin is treated as in Example 1 with silicone oil. After drying, the self-adhesive films do not curl and maintain their uniform shape continuously.

Example 7

For comparison, a sandpaper strip, as described in Example 1, is unilaterally coated with phenolic resin and conventional abrasives, on the uncoated side by rolling a mixture of butyl glycol and glycerin (80:20). As in Example 1, 10-15 g / m 2 are rolled. The strip of hicma obtained after evaporation retains only its transient uniform shape and begins to twist again after a short time *