DE2018214B - Use of a mixture of a cement-stable plastic dispersion and a mortar mixture or an aggregate as an adhesive or coating agent for foam sheets or sheets - Google Patents

Description

20th

It has long been known that foam sheets, in particular Polyslyrolschaumstoffplatten to be used for the insulation of buildings. When dressing up of facades with such foam panels, however, it was found that the used Adhesion promoters usually only have a moderate adhesive strength on polystyrene foam sheets. This is special the case when rough surfaces, such as B. Zicgclmaucrwcrk, sand-lime bricks, Bimskicsslcinc, Bcton. Aerated concrete and similar building materials require adhesive mortar in different layer thicknesses.

It is also known to use Mörlclmischungen KunslslofTdis] x: rsion to add to the Bicgczugfcsligkcit to increase. This makes the hardened Mörlcl Mixture much more elastic, so that it higher claims can be made (German Disclosure Document I 471 100). Mörlclmasscn with such Additives have good adhesive strength on common building substrates, but not on polystyrene foam panels. As a result, the bond between the panels on facades is often ineffective under the influence of the weather Frigc made by the different Dchnungskocrfizicntcn Tensions arise from property developers and foam planks, which can lead to damage. Therefore the adhesive strength of the adhesive mortar must be higher than the strength of the foam sheets.

The subject of the present invention is the use of a mixture of a non-stable plastic dispersion and a mortar mixture or an aggregate as adhesive or coating agent for foam sheets or sheets, the mixture of 4 to 15 percent by volume, based on the plastic sound, of a styrene butadicne Plastic dispersion, which contains 50 to 70 percent by weight styrene and 30 to 50 percent by weight butadiene, and from 96 to 85 percent by volume of a sand-cement mixture or an aggregate !! consists alone and the total wash noise of the mixture carries 10 to 20%.

Suitable styrene-butadine-plastic dispersions can be produced by known processes. The cement stability is decisive for the suitability of the dispersions. Zcmcnlstabil are dispersions which have such an electrolyte stability that no coagulation occurs during the mixing process with cement. In cement there are high electrolyte concentrations of polyvalent clays such as Ca ⁺ * and * * ⁺ , to which a plastic fraction is sensitive. Rs can therefore still be used IDispcrsionsschulzmillcl. Non-ionic stabilizers such as alkylaryl polyglycols, polyols, etc. are particularly suitable, since these do not significantly change the water absorption capacity and the setting capacity of the mortar mixture. They are used in amounts of from 1 to 3%, based on the dispersion. Of course, any other protective means can be used, provided that they meet the requirements. In addition, the addition of the synthetic resin dispersion must not prevent the mineral setting process of the cement. The dispersions used have Fcstkörpcrgchalle which ranges from 30 to 60 weight percent, preferably from 40 bit 55 weight percent, are. Preference is given to using styrene-butadiene dispersions which contain 50 to 70 percent by weight of styrene and 30 to 50 percent by weight of butadiene. Dispersions which contain 67 to 60 percent by weight styrene and 33 to 40 percent by weight butadiene are particularly suitable.

The amount of water contained in the total mixture is 10 to 20%. Care must be taken here be that part of the necessary water already through the Kunstsloffdispcrsion in the mixture has been introduced. The consistency of the plastic dispersion-mortar mixture should be made in such a way that it is neither too dry nor contains too much water, otherwise it cannot be processed.

It must be ensured that the dispersion still forms a film at the processing temperature. The decisive factor for this is the film formation temperature, i. H. the temperature at which the forms a coherent film from the dispersion. Under normal conditions, film formations are sufficient above 0 ° C, because the practical processing of water-based mortar mixtures takes place in this temperature range. So is z. B. the film formation temperature of a dispersion, which The plastic contains 40% butadiene at about +2 "C and that of a dispersion which contains 35% butadiene contained in the plastic, at around + 15 ° C.

Suitable for combination with the styrene-butadiene dispersions described are, for. B. Mortar after DIN 18 550 of the mortar group HI. Portland cement (e.g. Ty ^ PZ 275) is generally used. When Aggregates are particularly well suited to clay-free sands. When using fine sand with grain The ratio of cement to sand should be around 0 to 1 mm for 1: 2 room cells, for coarser sand as well Grain size up to 3 mm should be the ratio of cement to sand at 1: 3 spaces. It is beneficial finer sands for thinner loads, and thicker ones for thick ones For example, to use coarser sands.

In the case of foam vacancies in a thin layer, a central adhesive mortar can also be used, especially for interior work. Other aggregates instead of sand are possible, but generally not advantageous for reasons of price.

The adhesive mortars can be used in well-known materials. machines are manufactured. B »recommends that styrene * butadiene thickened with methylcyl chloride ·])! · Specification and the water required for the consistency must be available. Mixing in sund uir <of cement must be made in such a way that a good itkt wetting of the aggregates in every phase of the MisiShi Process is guaranteed. The finished mortar wewleii

2 O 1 8 2!

best with work equipment that is made of msi-free steel or plastic. The foundations usually have mixtures a sufficient pot life, which is around 4 to 6 hours at the same time. Should it be desired to extend the Tcpfzeil, normal setting retarders can be added.

All the usual building sites can be used as substrates, such as B. Zicgclmaucnvcrk, sand-lime bricks, Biniskicsslcinc, concrete, aerated concrete and similar building materials.

Be under foam sheets or sheets those made of polystyrene foam, polyurethane foam, glass foam and the like. Preferably used the mixtures according to the invention are used in the case of polystyrene foam sheets.

With the help of the adhesive mortars described, foam panels can be bonded to facades in a weatherproof manner.

OK to be. By coating the laid panels with the same mortar, the compressive strength is significantly increased, especially if the mortar is reinforced with synthetic fibers or, better, with fiberglass. Prefabricated building elements can also be produced from foam board and adhesive mortar, which combine high cold / heat insulation with low heat, good compressive strength and weather resistance using simple installation technology.

The mixtures according to the invention of styrene-butadicn-plastic dispersions and mortar mixtures have the surprising advantage that they - even after they have been exposed to the elements for a long time were - do not lose their adhesive properties. This was guaranteed with the previously known mixtures of a plastic dispersion and a mortar mixture not given in sufficient measure.

Examples binder

C. A styrene-butadiene dispersion with a 25 of an Alkylphcnolpolyoxäthylates is added. 75 Gc-slyrole-butadiene ratio of fO: 40 and a major part of the dispersion have a dry content of 25% by weight used by about 50%. So that the dispersion is cement-stable, during the polymerization 2.85%, based on the polymerization batch,

divide a 3% igcn methyl cellulose solution mixed. The following are then given in the tables Amounts of water added.

Binder-cement-mortar mixture

From this Bindemiltclgc.nKch corresponding Rauintcilc with 200 room dividers! Portland cement (type PZ 275) and a corresponding amount of sand intimately mixed in a stirrer.

in Tables II and III, apart from in experiments 9 and 16, commercially available products are used. If pure plastic dispersions are used, the binder was - as described above - scheduled. The adhesive mortar of experiments 9 to 12 and 16 to 19 consist of 100 parts of the volume of binding agent, 400 room pieces of sand (grain size up to 1 mm). 200 room pieces Portland cement (type PZ 275) and the specified amount of water. The commercially available finished products are applied according to the instructions for use; each is made of 100 parts Finished product run out.

Carrying out the exams

Table I (quantities in parts of the room)

binder I on free sand 0 to .1 mm Amount of water Adhesion Strength Aulomalcn- separation Attempt·) Grit cut plntic " 0 to 1 mm 600 180 Plaltc bad Interface A. - 400 .— 170 bad bad Interface B. 60 - 600 100 bad bad Interface C. 60 400 - 95 bad bad Interface D. 80 - 600 85 bad medium Interface I. 80 400 - 80 medium medium Interface 2 100 - 600 63 medium good Well in the foam 3 100 400 - 60 Well Well in the foam 4th 150 - 600 25th Well very good in the foam 5 150 400 - ^. 20th very good very good in the foam 6th 200 ' 600 very good very good in the foam 7th 200 400 - very good very good in the foam R. - very good

"D" with OuchsUben betttchneleti attempts and not approved.

2 C) 1 θ 2

Table It

(Quantities in room dividers!)

MOM

attempt

nimlcmillcl

Styrene-butadicn copolys

cement stable .. ,,,,

Polyvinyl acetate .. <

Vinyl propionate copolymer;

Acrylicstcr Copolymer ....

Handicraft product *) Basis: PVAc

Handicraft **) Basis: PVP .....,.,.,.

Hand-made product ***) Basis: PVAc

f.'iinü
grain.
0 to I rntrt Know-how 400
400 63
100 400 110 400 65 - 90 400 150 - 35

cut
I ¹ IiIIIe

Well

Poorly-
medium

bad-
medium
bad-
medium

bad-
medium

bad-
..litte!

bad-
medium

gkcil
Aulomalen-
pliltlc separation Well
bad-
medium in the foam
Interface bad-
medium
bad-
medium Interface
Interface bad-
medium Interface bad-
medium Interface bad-
medium Interface

·) Ready-to-use mortar in dry form (contains sand and cement). ** ji liquid binding agent * ·· | ι Liquid binder + filler (rc.

. A plastic ring 10 mm high and 40 mm in diameter is placed on a square polystyrene foam plate (density 2.5 kg / m ^{3) with a side length of 75 mm, at least 10 mm thick.} This ring is filled to the brim with the mortar mixing and then peeled off immediately.

Care must be taken that the Pulling off the ring does not entrain any adhesive mortar Will.

In order to achieve optimal drying, the mortar is allowed to set for 48 hours. For testing the adhesive strength of the mortar on the polystyrene layer, the mortar block is removed with the help of a flat object, which is pushed up to 2 mm between the foam board and the M'ör'clbrockcn, lifted off.

It is found here that the values for the adhesive strength of cut panels are somewhat more favorable are because these have a rougher surface and a looser one Gcfuge own as the machine panels.

Table US

attempt

binder

Styrene-butadicn copolymer cement-stable

Polyvinyl acetate

Vinyl propionate copolymer ....

Acrylic polymer copolymers

Hanclclsprodukl *) Basis: l'VAc Handicraft *) Basis: PVP Handicraft *) Basis: PVAc

Rating according to DIN Sl 221 separation 22 kgf / cm ² in the foam 0.68 kg / cm ² Interface 1.32 kg / cm ² . Boundary surface 0.84 kg / cm ² Interface 0.42 kg / cm ² Interface 0.22 kg / cm ² Interface 0.15 kg / cm ² Interface

*) Confirmation (. «. Tn at Ic II).

r ^; It is about the same mixture of juice and mortar as in Table II. The mortar is thinned with buckets of teeth on the foam board in a thickness of 30 mm; Flillclic: 30 χ 75 mm; Space acwichll 25 kg / m '; AutomuKnplat (c) applied, the treated sample "stUc; k is pressed firmly by hand over the entire surface of an asbestos cement plate. The mortar sets within 48 hours. The Bees mood of the tensile values is then based on DIN 51 2? .L.

Claims (1)

Claim: Use of a mixture of a zcmcntstabilcn plastic dispersion and a mortar mixture or an aggregate as an adhesive or Coating agents for foam slabs or sheets, the mixture of 4 to 15 percent by volume, based on the Fcstsloffgchall, of a styrene-Buladicn-Kunslsloffdispcrsion containing 50 to 70 percent by weight of styrene and 30 to 50 percent by weight of butadiene, and 96 to 85 percent by volume of a sand -Zemenl mixture or an aggregate alone and the total water content of the mixture is 10 to 20%.