ES2317779B1 - GLASSED PANEL. - Google Patents

Abstract

Glazed panel that is constituted essentially by a glass sheet, an optional activator of the adhesion provided on the surface of the glass sheet and a lacquer applied on the surface of the glass sheet and adapted to be able to see through the glass sheet, in which said lacquer consists of a paint comprising a resin based Acrylic

Description

Glazed panel.

The present invention relates to panels glazes, and in particular coated glass sheets, in particular, to glass sheets with a layer of lacquer that consists, for example, in a paint applied on a surface of the same.

The glass sheets according to the present The invention may have several applications. The sheets of lacquered glass can be used, for example, for purposes decorative furniture, wardrobes, such as furniture doors, such as dividing elements, in tables, shelves, in bathrooms, in exhibitors or, also, as a wall cover.

A wide variety of types have already been proposed other than paint to apply on glass sheets.

US Patent No. 6,277,492 refers to a two-layer paint system that is especially suitable for glass for automobiles and comprising a silicate paint water applied to glass, a silane activator material applied on water silicate paint and an organic paint of coating. As examples of paint base materials Organic acrylic, urethane, cellulosic resins are listed, alkyd, epoxides, fluorocarbon, phenolic, polyamide, polyurethane or vinyl as well as mixtures or copolymers thereof. It is noted that organic paint does not adhere properly to the glass in the absence of an underlying silicate based paint aqueous and of a silane activator material.

A wide variety of paints to form the rear paint layer of mirrors.

US Patent No. 5,248,331 discloses an inhibitor of the corrosion that can be used as a substitute for lead in a painting of the back layer of a mirror. Explicit examples of resins for said paint include alkyd resins, resins Acrylics, modified alkyd resins, polyesters, oils urethane, polymers or copolymers of vinyl halide, varnishes oleoresinous, nitrocellulose compositions, resin varnishes of phenolformaldehyde and epoxy resins. Resins are preferred alkyd or modified alkyd resins.

US Patent No. 6,979,478 refers to the use of certain stannous carboxylates and copper carboxylates for improve the compatibility of paints used in mirrors provided with a layer of silver. The resins used in the base of paint of said invention preferably include resins alkyd, polyester resins, acrylic resins, epoxides, modified epoxides, modified acrylics and other resins modified.

EP 0272572A1 exposes paintings special, which are hardened by UV irradiation and serve to form the rear layer of mirrors, and highlights its characteristic of have a high resistance to contraction during hardening Examples presented include monomers or polymerizable and ethylenically unsaturated oligomers, including these acrylic and methacrylic esters and vinyl monomers, as well such as urethane, polyester, polyether, epoxy and acrylic resins, all of them ethylenically unsaturated.

It is also well known to use paints to base of alkyl, alkylomelamine, epoxy or polyurethane which is applied directly to the back surface of a sheet of glass that has been adapted to be attached to a wall or another support structure.

The objective of the present invention is provide a sheet of lacquered glass that satisfies one or more of the following characteristics:

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 suitability to be used with a wide range of adhesives that preferably includes adhesive mortars or standard adhesive cements

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 aging resistance, especially due to exposure to cleaning products or humid environments

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 constitutes an alternative and preferably an improvement over products existing.

The prior art does not indicate that this is possible or how it could be achieved, or present any of the particular embodiments set forth herein invention. In particular, a wide range of paint compositions that could possibly be used but there is no clear indication as to what the composition would be of paints appropriate or advantageous for applications considered in the present invention.

The present invention provides a panel glazing according to independent claims. The subordinate claims define preferred aspects and / or Alternatives of the present invention.

The glazed panel is preferably a panel appropriate or adapted to be able to fix it to a support structure by any adhesive from the range of adhesives adhering to the lacquer Said adhesives can be selected from the group consisting of arbitrary combinations of synthetic resins, glues with silicone and adhesive mortars (glue mortar).

The use of an acrylic based resin for Lacquer can provide the desired combination of properties.

The lacquer is preferably applied in the form liquid on the glass sheet using, for example, the curtain or roller coating procedures and it hardens next. Solvents are preferably used in order of facilitating the liquid coating, the amount of solvent existing before hardening between 30 and 50% in weight. Once applied on the glass sheet, proceed usually to dry and harden the lacquer in an oven to a temperature of about 150 ° C for about 10 minutes, for example. The thickness of the lacquer, once hardened, It is in the range of 30 to 100 microns and preferably in 35 to 75 microns.

There may be an adhesion activator, for example, a silane, between the glass sheet and the lacquer. Lacquer may comprise an adhesion activator, for example, a silane, With the glass

The following immersion tests can be used to simulate accelerated panel aging glazes that are due in particular to exposure to agents of Cleaning or chemical products of adhesives:

- basic immersion test: immersion of the glazed panel in a NaOH solution (0.1 molar concentration) at 20 ° C for 72 hours

- acid immersion test 1: immersion of the glazed panel in a solution of HCl (0.1 molar concentration) at 20 ° C for 72 hours

- acid immersion test 2: immersion of glazed panel in a solution of H 2 SO 4 (concentration 0.05 molar) at 20 ° C for 72 hours.

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The durability of glazed panels determined by these tests is considered acceptable if not discolorations, bubbles, or any other defect appear visible.

The glazed panels according to the present invention preferably have an acceptable durability with Any of these tests.

We have observed that the glass panels of the prior art, which are provided with a paint based on alkyl on one of its surfaces, tend to present a discoloration in the paint when subjected to the test of acid immersion 1.

Glazed panel lacquer presents preferably a scratch resistance of at least 1000 g, preferably 1250 g, and more preferably 1500 g according to the Clemen test.

Clemen test is performed as follows: Shellac is pressed onto needle tip tungsten carbide by applying a weight said needle. The needle is used to scratch the lacquer along approximately 60 mm. Different weights (eg, from 500 g to 2500 g in 250 g intervals) are applied on the same sample leaving a certain distance between the different scratches. A series of parallel stripes can be obtained in this way on the surface of the sample. A detailed description of this test can be found in the international standard ISO 1518-1992. In the case of the present invention, scratch resistance is defined as the maximum weight with which the strip formed in the lacquer is not yet visible to the naked eye from the glass side of the glazed panel.

Lacquer surface tension is measured using a liquid index with a test ink according to the standard DIN 53364. The lacquer preferably has a surface tension of at least 32 mN / m, preferably at least 33 mN / m and more preferably at least 34 mN / m; this surface tension provides good adhesion properties with base adhesives of sylicon.

The adhesive force, especially that of silicone adhesives, can be determined by arranging the adhesive between the lacquer of the glazed panel and another substrate compatible with the adhesive considered, for example, the painted face of a mirror MNG-E manufactured by Glaverbel, performing then an adhesive tensile strength test and shearing. The glazed panels according to the present invention They can provide the following levels of adhesive strength expressed in kg / cm2:

one

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The type of rupture is preferably cohesive, that is, it is produced in the adhesive itself (it differs from the adhesive rupture - separation of the lacquer adhesive from the panel glaze).

As regards adhesive mortars, the adhesive strength with the lacquer of the glazed panels, which is measured According to EN1348, it can be:

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2

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The adhesive mortar preferably consists of a cementitious adhesive according to EN 1322, for example.

Glazed panels provided with mortar adhesive preferably do not have any visible sign of discoloration and / or bubble formation when subjected to a condensation test

The thickness of the glass sheet can be greater than 1 mm, 2 mm or 2.5 mm and less than 10 mm, 8 mm or 6 mm. He glass substrate thickness can be in the range from 1.8 mm to 8.2 mm. The glass sheet preferably consists of a glass of soda and lime; It can be a float glass.

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A glazed panel according to the present invention It can have the following properties:

3

The UV test is used to simulate the deterioration caused by solar irradiation. A detailed description of this test can be found in ASTM G53-88. The samples are exposed to ultraviolet light. The exposure conditions considered in the present invention are: 340 nm UVA lamp; UV lamp power: 300 W; duration of exposure to UV radiation: 1000 hours; temperature during exposure to UV radiation: 60 ° C; No exposure was performed under condensation conditions. No heat change should be observed after the test, the variation in color \ DeltaE ^ {\ text {*}} should preferably be less than 2. \ DeltaE ^ {\ text {*}} is calculated as follows : \ DeltaE ^ {\ text {*}} = \ surd (L ^ {\ text {*} 2} + a ^ {\ text {*} 2} + b ^ {\ text {*} 2}) where L ^ {\ text {*}} a ^ {\ text {*}} b ^ {\ text {*}} are measured using the CIElab scale.

The condensation test is used to control the behavior of the sample in humid environments and to detect any failure in the protection of the samples against corrosion. This test is described in detail in DIN50 017. The conditions considered in the present invention are: 98% relative humidity; temperature of 40 ° C; for 20 days No bubble formation or local shedding of the lacquer should be observed after the test.

Claims (16)

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1. Glazed panel that is constituted essentially by

i)

a glass sheet,

ii)

a optional adhesion activator provided on the surface of the glass sheet and

iii)

a lacquer applied on the surface of the glass sheet and adapted to be able to see through the glass sheet,

characterized in that said lacquer consists of a paint comprising an acrylic based resin. 2. Glazed panel that is constituted essentially by

i)

a glass sheet,

ii)

a optional adhesion activator provided on the surface of the glass sheet and

iii)

a lacquer applied on the surface of the glass sheet and adapted to be able to see through the glass sheet,

characterized in that said glazed panel has an acceptable durability in a basic immersion test as defined herein. 3. Glazed panel according to claim 1, in which the glazed panel has an acceptable durability in a basic immersion test as defined herein memory. 4. Glazed panel according to any of the previous claims, wherein the glazed panel a Acceptable durability in an acid immersion test as defined herein. 5. Glazed panel according to any of the previous claims, wherein the lacquer consists essentially in a paint that has a surface tension of at least 32 mN / m, preferably at least 33 mN / m and more preferably at least 34 mN / m. 6. Glazed panel according to any of the previous claims, wherein the glazed panel is adapted to be able to fix it to a support structure by means of of a silicone based adhesive adhered to the lacquer. 7. Glazed panel according to any of the previous claims, wherein the glazed panel is adapted to be able to fix it to a support structure by means of of an adhesive mortar adhered to the lacquer. 8. Glazed panel according to any of the previous claims wherein the resin for lacquer understands: a methacrylic resin (preferably in a amount of 50 to 90% by weight and more preferably in an amount 60 to 80% by weight); a formaldehyde melamine (preferably in a amount of 5 to 35% by weight and more preferably in an amount 15 to 25% by weight); Y an epoxy (preferably in an amount of 5 to 35% by weight and more preferably in an amount of 15 to 25% in weight). 9. Glazed panel according to any of the previous claims wherein the lacquer resin is It consists essentially of: a methacrylic resin (preferably in a amount of 50 to 90% by weight and more preferably in an amount 60 to 80% by weight); a formaldehyde melamine (preferably in a amount of 5 to 35% by weight and more preferably in an amount 15 to 25% by weight); Y an epoxy (preferably in an amount of 5 to 35% by weight and more preferably in an amount of 15 to 25% in weight). 10. Glazed panel according to any of the previous claims, wherein the lacquer applied on the glazed panel comprises (once hardened): 35 to 45% pigments and 55 to 65% resin or 45 to 55% pigments and 45 to 55% resin.

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11. Glazed panel according to any of the previous claims, wherein the adhesive strength under traction between the lacquer and an adhesive is, expressed in kg / cm2: 4 12. Glazed panel according to any of the previous claims, wherein the adhesive strength under shear between the lacquer and an adhesive is, expressed in kg / cm2: 5 13. Glazed panel according to any of the previous claims, wherein the adhesive strength of a adhesive mortar with respect to the lacquer measured according to the standard EN1348 is greater than or equal to 1.3 N / mm. 14. Glazed panel according to claim 13, wherein the adhesive mortar is a cementitious adhesive such as defined in standard EN 1322. 15. Glazed panel according to any of the previous claims, wherein the glazed panel is a flat glass floated with soda and lime. 16. Use of a resin paint with base acrylic applied on a flat substrate of soda and lime glass to in order to create compatibility with an adhesive and obtain a appropriate aging resistance when it is fixed to a support structure using synthetic resins, adhesives silicone and adhesive mortars.