NL1005690C2 - Flexible building filler and sealant composition - Google Patents

Abstract

Pasty filler and sealant composition comprising at least 10 wt. % of a medium-viscosity acrylic binder, at least 30 wt. % inert fillers, at least 1 wt. % urethane resin and water as dispersing agent.

Description

Title: Non-cementitious flexible pasty product with a stone or joint appearance.

The invention relates to a flexible filling material or sealing material for use in the construction industry. More particularly, the invention relates to a non-cement-bound flexible pasty product with a stone or joint appearance.

It is well known that building materials, such as stones, concrete, wood and metal, exhibit continuous shrinkage and expansion. These material properties depend on many conditions, in particular on temperature and humidity. Moreover, it is generally known that the degree of shrinkage and expansion is different for each material used. All this creates stresses in a building, which stresses can lead to cracks in stones or other building materials, in joints and seams or other connections. Apart from problems such as leakage and drafts, such defects give the building a less attractive appearance.

It is possible to use expansion calculations to install so-called expansion joints in the structure. Such expansion joints should form a buffer against shrinkage and expansion and thus prevent damage and cracks in walls or places where similar or non-similar materials touch. A drawback of such expansion joints is that they are usually annoyingly visible.

The expansion joints currently made are usually sealed with all kinds of kits, for example silicone kits, polysulfide kits (thiolket kits) and acrylic kits. These kits are offered in 30 different colors. A drawback of these materials is that they exhibit a high degree of gloss and are always visible with respect to the substrate or background on which they are applied.

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It is also known to introduce plasticizers into cementitious joints. Although these plasticizers make the cement joints slightly more flexible, they are unable to absorb excessive stresses, so that the whole remains sensitive to cracking and cracking.

In addition, various types of filler, filler and paint pastes are used as a sealant. Many types of filler become hard and brittle after application, while fillers and paint pastes always show shine. These types of products, which contain up to about 5% by weight of binder and mainly chalk and lime, remain visible even in the case of coloring.

There is therefore a need for a material that can seal cracks, joints, seams and other interrupted connections 15 in such a way that the seal is barely visible. One of the requirements for such a material is that it must remain flexible or plastic after application, so that tearing or cracking does not occur again. In addition, the material should give good adhesion mainly to all building materials to be used. Finally, the material should have an appearance that is as close as possible to the appearance of the environment on or in which it is applied. In other words, after application, the product must have the color and appearance of, for example, the stone or the joint.

According to the invention, a product has now been found which has the aforementioned properties and which thus overcomes the drawbacks known from the prior art. The invention provides a material which remains flexible after application and which adheres excellently to basic materials used in non-residential construction, such as stone, concrete and wood, and which has a stone, concrete or joint appearance - that is to say an appearance that is color, gloss and roughness resembles stone, concrete and joint material.

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More particularly, the invention relates to a pasty composition comprising at least 10% by weight of an acrylic based medium viscosity binder, at least 30% by weight of inert fillers, at least 1% by weight of urethane resin and water as a dispersant. A composition suitable for filling joints and for bridging cracks comprises 10-30 parts by weight, preferably 12-20 parts by weight of an acrylic-based medium-viscous binder; 60-80 parts by weight, preferably 65-75 parts by weight of one or more inert fillers; 8-30 parts by weight, preferably 10-20 parts by weight of water as a solvent or dispersant, and 1-5 parts by weight, preferably 1-3 parts by weight of polyurethane.

The acrylate-based binder used according to the invention must be medium-viscous, ie it must have a viscosity in the range between 4000 and 10,000 mPa.s (Brookfield, spindle 5, 20 rpm 20 ° C), and at preferable to have between 5500 and 8500 mPa.s. This essential constituent mainly provides the flexible or plasto-elastic character and the adhesive power of the product according to the invention.

The binder can be a polymer of one or more (meth) acrylic acids or escers thereof, as well as a co- or interpolymer of such (meth) acrylic acids or esters and vinyl aromatic monomers and optionally other monomers. Such products are commercially available, exemplified by Propiofan 290D (Hoechst), Propiofan 590D (Hoechst), SAC 4450 (Alberdingh Boley), SC 44 (Alberdingh Boley) and Uramul SC 120 (DSM 30 Resins).

In a preferred embodiment, however, a medium-viscosity copolymer of one or more acrylic acid esters, most preferably C 1-6 alcohol esters and in particular the methyl and butyl ester, and styrene is used. Advantageously, copolymers are used which contain 10-25%, most preferably 14-20% by weight, based on the weight of the polymer, of 10056904 styrene. Furthermore, it has been found that a tougher product and an improved adhesion can be obtained if 5-15 wt.%, And preferably 8-12 wt.%, Of acrylonitrile is also added during the copolymerization.

The second essential component of the pasty compositions of the invention are the inert fillers. Essentially, the high proportion of this group of ingredients ensures that the appliquéd product assumes the appearance, in particular the degree of gloss and profile, of the environment to which it is applied. The inert fillers should be chosen so that the color and grain size of the finished product essentially matches the environment to which it is applied. The inert fillers are therefore selected according to the application from, for example, different types of sand, lime, fillers such as microtalk (for example from Norwegian Talc), dolomite and durcal (products available from Boekamp), as well as dyes from the inorganic and / or the organic type, eg titanium dioxide (rutile) and iron oxides.

For example, to remove cracks in sand-lime brick, a mixture of lime and sand with the desired dye (s) is used. For the application in brick, mainly sand and colorant are used, although it is also possible to introduce finely ground brick into the product.

In addition, it is considered essential for the preparation and processing of the product that at least some water is present in the product. This water can be added unless the acrylate binder is prepared or supplied with the desired water content.

A fourth essential ingredient is a polyurethane or other polymer which provides cross-linking in the presence of the other ingredients of the pasty product. The polyurethane makes the product according to the invention less plastic than if 1005690 were exclusively used with acrylic binder. Furthermore, this polymer gives a thickening in the mass and a better shore hardness. A suitable polyurethane is Ser-AD FX 1010 (Servo Delden).

In addition to the essential ingredients, a number of auxiliary substances (usually in an amount of less than 0.5 parts by weight, preferably 0.2 parts by weight) can also be used. are used in the product according to the invention, in particular are mentioned anti-foaming agents (for example 10 Dehydran 1293 (Henkel)), fungicides (for example Preventol D7 (Bayer)) and plasticizers, in particular Vertimol (Rohm & Haas) and DOP (Vos) . In addition, it has been found to be advantageous to add a small amount of a water repellant such as polysiloxane to ensure good water resistance.

The product according to the invention has a plasto-elastic character. It preferably has a tensile strength of at least 1.3 N / mm 2, more preferably of at least 1.5 N / mm 2, for example 1.7 N / mm 2. The crack bridging 20 (ISO 37) at + 8 ° C is at least 3 mm and usually 4 mm, while it has a value at -3 ° C of at least 2.5 and usually 3 mm. For the product according to the invention after 7 days the tear resistance at 20 ° C and a relative humidity is in the vicinity of 0.6-0.7 N / mm 3 at a layer thickness of 2.7 mm while the elongation to break (ISO 8339) 10-15%. After 28 days for a layer thickness of 2.6 mm, values of 0.8-1.2 N / mm2 and 18-21% were found; while these values after 90 days for a layer thickness of 2.34 mm were about 1.2-1.4 N / mm 2 and 20-23%. In other words, the product acquired a more elastic character over time.

The adhesive strength of the product according to the invention is at least about 1.5 N / mm2, usually about 2.0 N / mm2.

The products of the invention are prepared by mixing the essential ingredients together in the desired ratios 1005690 6 and then kneading. It is essential here that the polyurethane or other cross-linking agent is added as the last ingredient after a homogeneous mixture of the other ingredients has already been obtained.

The plasto-elastic product according to the invention can be used for many applications; both as a repair agent and as a primary construction material such as joint filling. Thus, the product is ideally suited for finishing or eliminating cracks or cracks resulting from shrinkage or other structural cracks, as well as for finishing shrink joints or expansion joints and the like. The product is not only useful for getting rid of cracks, bark, seams and joints in the same base material. It can also be used to, for example, conceal negative edges around window frames, connections to facade elements, and elastic connections between, for example, window sill stones and negative edges, in the style of the building as much as possible.

According to a preferred embodiment, the product according to the invention is a flexible, crack-bridging spray finish for walls and ceilings, which spray finish can be processed in the same manner and has the same appearance as known spacks, which are widely used in the so-called "wet construction". are applied.

Spacks are aqueous lime-rich or gypsum-rich paste compositions, examples of which can be mentioned products offered under the trademark Spackle ™, which paste compositions form a rigid sealing layer after drying. However, these layers tear relatively quickly.

The spray finishes according to the invention, on the other hand, remain flexible after application and can be painted over with any (acrylic) paint. In this application, a significant amount of titanium dioxide and microtalk is used as a filler, while any 1005 690 7 sand particles that are present are required to be smaller than 0.2 mm, and preferably less than 0.1 mm, because otherwise blocking problems may arise . A suitable spray finish according to the invention 40-60 parts by weight of the medium-viscosity binder, 20-40 parts by weight of inert filler with a maximum particle diameter of 0.2 mm, 10-25 parts by weight of water and 1-3 parts by weight polyurethane. Preferably a material powder such as an aluminum silicate can be added.

Finally, it appears that when the spray composition and the joint filling composition are mixed in a weight ratio of about 1: 1, an excellent filler is formed.

The product according to the invention has a neutral pH of about 7-8 and therefore does not react aggressively with the substrate.

In order to properly apply the product according to the invention to a surface, the surface must be clean and free of dust, rust, grease, oil and other contaminants. Loose parts, such as joints, must be completely removed. Cracks and cracks are preferably milled out, most preferably V-shaped. Highly absorbent surfaces are preferably primed first, for example with an acrylic resin. Excessive cracks and splits, as well as joints, can be pre-filled with a flexible resin composition, for example polyester or polyurethane joint fillings, which resin composition is then primed or primed with an acrylic dispersion.

The prepared substrate is then filled with the product according to the invention to the desired filling height, taking into account a shrinkage of 10-20%. The paste can be processed at a temperature of at least about 10 ° C with conventional sealing tools, such as a hand or compressed air gun, a trowel, putty knife, trowel or joint nail. With 100 5 6 9 0 8 textured combs or brush, the texture can be adjusted as desired.

During endurance tests, at least aging tests, it has been found that the product according to the invention is still flexible even 5 years after application and adheres well to the substrate, and therefore fulfills its function. Moreover, it also appears that the product according to the invention ages substantially in the same way as the substrate, so that even after 5 years the product according to the invention fits in appearance with the substrate.

The invention will now be further illustrated by the following non-limiting example. In this example, percentages are based on the weight of the total composition.

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Example 1 Joint filler

A dispersion was prepared from 280 parts of Propiofan 290D (water content 40%) and 647 parts of quartz (with grain sizes in the range 0.2-0.5 mm). To this dispersion was added 10 parts of rutile titanium oxide, 10 parts of lime and 51 parts of microtalk, as well as 12 parts of each of Dehydran 1293 antifoaming agent, Preventol D7 fungicide and Vertimol plasticizer, followed by this to a elastic mass was kneaded. Finally, 20 parts of Ser-AD FX 1010 were added. Thus, a pasty product with a plasto-elastic character resulted in a density of 1.48 g / cm3. This product formed a skin after 20 minutes at a temperature of 23 ° C at a relative humidity of 50%. The curing time was 1-2 weeks. The product had a shrinkage (DIN 25451) of about 18% by volume, an elongation to break (ISO 8339) of 25% after curing, while the maximum durable permissible deformation was 15%. In cured form, the product had a temperature resistance of -20 ° C to 75 ° C. In wet, uncured form, the product was found to be sensitive to frost.

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Example 2 Spray finish

From 17.5 parts of water, 48 parts of Propiofan 290D, 6 parts of quartz (maximum grain size 1 mm), 4 parts of rutile titanium oxide, 22 parts of microtalk, 2.5 parts of 5 powdered material ( Lancomat), additives and 2 parts Ser-AD FX 1010, a product was prepared in accordance with Example 1 which was excellent as a spray finish.

1005690

Claims (7)

A pasty composition comprising at least 10% by weight of an acrylic based medium viscosity binder, at least 30% by weight of inert fillers, at least 1% by weight of urethane resin and water as a dispersant. The composition of claim 1 comprising 10-30 parts by weight of an acrylic-based medium-viscous binder; 60-80 parts by weight of one or more inert fillers; 8-30 parts by weight of water as a solvent or dispersant; and 1-5 parts by weight of polyurethane. A composition according to claim 1 or 2, comprising 12-20 parts by weight of the agent-viscous binder; 65-75 parts by weight of inert fillers; 10-20 parts by weight of water; and 1-3 parts of polyurethane. The composition according to claim 1, comprising 40-60 parts by weight of the medium-viscosity binder, 20-40 parts by weight of inert filler with a maximum particle diameter of 0.2 mm, 10-25 parts by weight of water and 1-3 wt. .dln polyurethane. 5. A composition according to claim 1 or 2, wherein the acrylate binder is a copolymer of styrene and one or more (meth) acrylic acids or esters thereof. 6. A method of preparing the composition according to any one of the preceding claims, comprising kneading all ingredients in the desired weight ratios except the polyurethane to a homogeneous product, and adding the polyurethane. 7. Use of at least 10% by weight of a medium-viscous acrylate resin and at least 1% by weight of polyurethane as a binder system for inert fillers to obtain a stone or joint appearance. 1005690 «-. _ COOPERATION TREATY (PCT) REPORT ON NEWNESS RESEARCH OF INTERNATIONAL TYPE IDENTIFICATION OF THE NATIONAL APPLICATION Characteristic of the applicant or ν · η authorized * __________NW 1066 __ Netherlands * · Application No. Filing date 1005690 (1 April 1997 Applicant Prior) Name Applicant . VERF B.V. Date of the request for an international type study Submitted by the International Research Institute (ISA) to the request for an international type study No. SN 29335 EN I. SUBJECT CLASSIFICATION (where different classifications apply, all specify rating symbols) Follow * the International Classification IIPC) Int. Cl.6; C 04 B 26/06, C 09 K 3/10, C 09 D 5/34 II. FIELDS OF TECHNIQUE RESEARCHED __Researched minimum documentation Cla * »ification * y * teem__Cia ** ificatit» ymOolen_ Int. Cl.6 C 04 B, C 09 K, C 09 D Examined »Other · Documentation and Minimum Documentation insofar as such documents are included in the areas investigated. EN II NO RESEARCH POSSIBLE FOR CERTAIN CONCLUSIONS (comments on supplementary sheet) fS * V · I 1 LACK OF UNIT OF INVENTION (comments on supplement sheet)