REDISPERSIBLE POWDER POLYMERS |

REDISPERSIBLE POWDER POLYMERS

Redispersible polymer powders

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REDISPERSIBLE POLYMER POWDERS

DESCRIPTION

Redispersible polymer powder

Synonyms : RPP, polymer powder, polymer additive, RDP

Redispersible polymer powder (RPP) is a polymer capable, when mixed with water, to redisperse, again form aqueous polymer dispersions, which, as a result of curing, form a continuous polymer film, contributing to high water-holding capacity, adhesion and workability of dry building mixtures. 

Production method

The redispersible powder is obtained by spray drying a latex emulsion. To prevent the latex particles from sticking together during production and when diluted with water, polyvinyl alcohol is used. RPP (dry latexes) are usually produced on the basis of: polyvinyl acetate, copolymers of vinyl acetate with ethylene, copolymers of vinyl acetate with vinyl versatate, as well as acrylic polymers.

Properties

After mixing the dry mixture with water, the powder goes into dispersion and after drying forms a film. The film increases adhesion and elasticity, however, the more adhesion, the less elasticity and vice versa. Accordingly, powders are divided into rigid ones with high adhesion, highly elastic with low adhesion, and medium elastic with normal adhesion. In some powders, water repellents are added, imparting hydrophobic properties to the system.

Application area

Redispersible polymer powders are used in the manufacture of products such as:

- Tile adhesives; 

- Plasters; 

- Putties;

- Repair compositions; 

- Waterproofing; 

- Self-leveling floors, etc. 

Organik kimya

ORP 6072 MP

ORP 7085 HM

ORP 7090 RD

ORP 7099 RD

ORP 7365 HP

ORP 7680 SL

ORP Hydroflex 64

ORP Thermobond 45

ORP Thermobond 65

ORP Thermobond 74

ORP 6072 MP

ORP 6072 MP is a redispersible powder obtained by drying a Vinyl Acetate / Vinyl Versatate / Acrylic Terpolymer emulsion with PVA as a protective colloid. The specific chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to various substrates.

ORP 6072 MP is used for modifying mixtures containing various binders. Due to its special physical / chemical composition, ORP 6072 MP improves the adhesion, flexibility and water resistance of mortars containing cement, gypsum or lime. ORP 6072 MP provides excellent performance after heat aging and immersion in water.

Recommended area of ​​application

Tile adhesive C1: 0.5 - 1.0%

Tile adhesive C2: 2.0 - 5.0%

Adhesive for SFTK: 1.0 - 2.0%

Product properties

Chemical base

VinylAcetate / VinylVersatate / Acrylic Terpolymer (VA / VV / Acrylic Terpolymer)

Minimum foaming temperature

8 ± 1 C

Ash content at 600 C

14 ± 2%

Bulk density

400-600 kg / m3

Characteristics

Due to its strong adhesion properties, ORP 6072 MP can be used for the production of tile adhesives and SFTK adhesives that fully comply with the requirements of the standards.

With excellent adhesion, abrasion and moisture resistance, ORP 6072 MP can be used in grouting and repair mortars ranging from 2.0 to 4.0%.

Due to its excellent water resistance and compressive strength, ORP 6072 MP can also be used in SFTK plasters, from 3.0 to 5.0%.

ORP 7085 HM

ORP 7085 HM is a redispersible powder obtained by drying a Vinyl Acetate / Acrylic copolymer emulsion with PVA as a protective colloid. The specific chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to various substrates. ORP 7085 HM is used to modify mixtures containing various binders.

Recommended area of ​​application

Tile adhesive C1: 0.5 - 1.0%

Tile adhesive C2: 2.0 - 5.0%

Product properties

Chemical base

VinylAcetate / Acrylic Copolymer (VA / Acrylic Copolymer)

Minimum foaming temperature

7 ± 1 C

Ash content at 600 C

12 ± 2%

Bulk density

350-550 kg / m3

Characteristics

Due to its high adhesion properties, ORP 7085 HM can be used for the production of tile adhesives that fully meet the C1 and C2 requirements.

With excellent adhesion, abrasion and water resistance, ORP 7085 HM can be used in repair mortars at a dosage of 1.0 - 2.0%.

ORP 7090 RD

ORP 7090 RD is a redispersible powder obtained by drying a Vinyl Acetate / Acrylic Copolymer emulsion with PVA as a protective colloid. The specific chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to various substrates.

ORP 7090 RD is used for modifying mixtures containing various binders. Due to its special physical / chemical composition, ORP 7090 RD improves the adhesion, flexibility and water resistance of mortars containing cement, gypsum or lime.

Recommended area of ​​application

Tile adhesive C1: 0.5 - 1.0%

Tile adhesive C2: 2.0 - 5.0%

Product properties

Chemical base

VinylAcetate / Acrylic Copolymer (VA / Acrylic Copolymer)

Minimum foaming temperature

8 ± 1 C

Ash content at 600 C

12 ± 2%

Bulk density

400-600 kg / m3

Characteristics

Due to its high adhesive properties, ORP 7090 RD can be used for the production of tile adhesives that are fully compliant with C1 and C2 requirements.

With excellent adhesion, abrasion and water resistance, ORP 7090 RD can be used in repair mortars at a dosage of 1.0 - 2.0%.

ORP 7099 RD

RP 7099 RD is a redispersible powder obtained by drying a Vinyl Acetate / Acrylic copolymer emulsion with PVA as a protective colloid. The specific chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to various substrates.

ORP 7099 RD is used for modifying mixtures containing various binders. Due to its special physical / chemical composition, ORP 7099 RD improves the adhesion, flexibility and water resistance of mortars containing cement, gypsum or lime.

Recommended area of ​​application

Tile adhesive C1: 0.5 - 1.0%

Tile adhesive C2: 2.0 - 5.0%

Product properties

Chemical base

VinylAcetate / Acrylic Copolymer (VA / Acrylic Copolymer)

Minimum foaming temperature

5 ± 1 C

Ash content at 600 C

12 ± 2%

Bulk density

400-600 kg / m3

Characteristics

Due to its high adhesion properties, ORP 7099 RD can be used for the production of tile adhesives that are fully compliant with C1 and C2 requirements.

With excellent adhesion, abrasion and water resistance, ORP 7099 RD can be used in repair mortars at a dosage of 1.0 - 2.0%.

ORP 7365 HP

ORP 7365 HP is a redispersible powder obtained by drying a Vinyl Acetate / Acrylic copolymer emulsion with PVA as a protective colloid. The chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and provides good adhesion to mineral substrates. ORP 7365 HP is used for modifying mixtures containing various binders. Due to its special physical / chemical composition, ORP 7365 HP improves adhesion, abrasion resistance, elasticity and water resistance of mortars.

Recommended area of ​​application

Plastering compounds in SFTK 3.0 - 5.0%

One-component waterproofing mortars 7.0 - 10.0%

Grouting compounds for tiles 2.0 - 4.0%

Product properties

Chemical base

VinylAcetate / Acrylic Copolymer (VA / Acrylic Copolymer)
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Minimum foaming temperature

0 ± 1 C

Ash content at 600 C

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14 ± 2%

Bulk density

400-600 kg / m3

Characteristics

Due to its excellent water resistance, elasticity and compressive strength, ORP 7365 HP can be used for plasters in SPTC.

Due to its excellent flexibility, hydrophobicity and water resistance, ORP 7365 HP can be used in one-component waterproofing mortars.

With excellent abrasion, flexibility and water resistance, ORP 7365 HP can be used in tile grouting compounds.

ORP 7680 SL

ORP 7680 SL is a redispersible powder obtained by drying a Vinyl Acetate / Acrylic copolymer emulsion with PVA as a protective colloid. The specific chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to various substrates.

ORP 7680 SL is used for modifying mixtures containing various binders. Due to its special physical / chemical composition, ORP 7680 SL improves the adhesion, flexibility and water resistance of mortars containing cement, gypsum or lime. Especially in self-leveling mortars, ORP 7680 SL provides excellent abrasion resistance, high flexural and compressive strength and good leveling during application.

Recommended area of ​​application

Self-leveling compounds with a dosage of 0.5% to 4%

Repair compositions

Product properties

Chemical base

VinylAcetate / Acrylic Copolymer (VA / Acrylic Copolymer)

Minimum foaming temperature

5 ± 1 C

Ash content at 600 C

12 ± 2%

Bulk density

400-600 kg / m3

Characteristics

The use of ORP 7680 SL provides high wear resistance, water resistance, flexural and compressive strength.

Reduces sedimentation and efflorescence

ORP Hydroflex 64

ORP Hydroflex 64 is a redispersible powder obtained by drying a Vinyl Acetate / Vinyl Versatate / Acrylic terpolymer emulsion with PVA as a protective colloid. The chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to mineral substrates. ORP Hydroflex 64 is used for the modification of mixtures containing various binders. Thanks to its special physical / chemical composition, ORP Hydroflex 64 improves the adhesion, elasticity, hydrophobicity and water resistance of mortars. Due to its elasticity, ORP Hydroflex 64 performs very well in transverse deformation conditions.

Recommended area of ​​application

One-component waterproofing mortars 7.0 - 12.0%

Tile adhesives (CG2) at a dosage of 2.0 to 4.0%, no additional hydrophobic agent required

Grouting compounds for tiles 1.5 - 3.0%

Cement-based plasters and topcoats with a dosage of 2.0 - 4.0%

Product properties

Chemical base

Vinyl Acetate / Vinyl Versatate / Acrylic Terpolymer VA / VeoVa / Acrylic Terpolymer

Minimum foaming temperature

0 ± 1 C

Ash content at 600 C

12 ± 2%

Bulk density

400-600 kg / m3

Characteristics

ORP Hydroflex 64 can be used in mortar formulations where high flexibility / elasticity, hydrophobicity and water resistance are required at the same time

Excellent performance at low dosages in resilient one-piece membrane formulations

ORP Thermobond 45

ORP Thermobond 45 is a redispersible powder obtained by drying an emulsion of Vinyl Acrylic Copolymer with PVA as a protective colloid. The specific chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to various substrates. ORP Thermobond 45 is used to modify mixtures containing various binders. Thanks to its special physical / chemical composition, ORP Thermobond 45 improves the adhesion and elasticity of mortars containing cement, gypsum or lime.

Recommended area of ​​application

ORP Thermobond 45 can be used for the production of cement basecoats applied to EPS and XPS boards in SFTC 1.0 - 3.0%.

Adhesives for EPS and XPS boards in SFTK 0.5 - 2.0%.

Product properties

Chemical base

Vinyl Acrylic Copolymer

Minimum foaming temperature

5 ± 1 C

Ash content at 600 C

14 ± 2%

Bulk density

400-600 kg / m3

Characteristics

ORP Thermobond 45 can be used in formulations where good flexibility / elasticity, impact resistance and thixotropic mortar behavior are required.

ORP Thermobond 65

ORP Thermobond 65 is a redispersible powder obtained by drying a Vinyl Acetate / VeoVa / Acrylic terpolymer emulsion with PVA as a protective colloid. The chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and provides good adhesion to mineral substrates. ORP Thermobond 65 is used to modify mixtures containing various binders. Due to its special physical / chemical composition, ORP Thermobond 65 improves the adhesion, elasticity and water resistance of mortars. Especially because of the elastic nature of ORP Thermobond 65 performs well under lateral deformation conditions.

Recommended area of ​​application

Cement basecoats applied to EPS and XPS boards in SFTK 3.0 - 5.0%.

Adhesives for EPS and XPS boards in SFTK 1.0 - 2.0%.

Elastic tile adhesives (S1 and S2) 3.0 - 7.0%.

Product properties

Chemical base

Vinyl Acetate / VeoVa / Acrylic Terpolymer (VA / VeoVa / Acrylic Terpolymer)

Minimum foaming temperature

0 C

Ash content at 600 C

12 ± 2%

Bulk density

400-600 kg / m3

Characteristics

ORP Thermobond 65 can be used in formulations where good flexibility / elasticity, impact resistance and thixotropic mortar behavior as well as excellent water resistance are required

ORP Thermobond 74

ORP Thermobond 74 is a redispersible powder obtained by drying a Vinyl Acetate / Acrylic copolymer emulsion with PVA as a protective colloid. The chemical composition of the polymer ensures the coalescence of the redispersible polymer at low temperatures and ensures good adhesion to mineral substrates. ORP Thermobond 74 is used for modifying mixtures containing various binders. Thanks to its special physical / chemical composition, ORP Thermobond 74 improves the adhesion, elasticity and water resistance of mortars. Especially because of the elastic nature of ORP Thermobond 74 works very well under lateral deformation conditions.

Recommended area of ​​application

Cement basecoats applied to EPS and XPS boards in SFTK 3.0 - 5.0%.

Adhesives for EPS and XPS boards in SFTK 1.0 - 2.0%.

Elastic tile adhesives (S1 and S2) 3.0 - 7.0%.

Product properties

Chemical base

Vinyl Acetate / Acrylic Copolymer (VA / Acrylic Copolymer)

Minimum foaming temperature

0 C

Ash content at 600 C

14 ± 2%

Bulk density

400-600 kg / m3

Characteristics

ORP Thermobond 74 can be used in formulations where good flexibility / elasticity, impact resistance and thixotropic mortar behavior are required.

The present invention concerns redispersible polymer powders, which excel especially by good storage stability and can be used in many ways, for example, in hydraulically binding systems, but also as a binder in the most varied applications, and can be prepared by spray-drying of aqueous dispersions.

The use of polymer powders as additive, especially for hydraulically binding systems or as binder in coating compositions is generally known. Such additives improve the application properties of the systems in which they are used. Thus, when used in hydraulically binding compositions, the bending and tensile strength of construction materials to which they are added, are improved. Moreover, they have an improving influence on the processability of the construction materials.

The production of such powders is known and, for example, is described in the following patents:

In EP 0134451, the use of various naturally occurring water-soluble substances, such as starches, starch derivatives, proteins and/or water-soluble polymers are named as spray additives in the preparation of redispersible dispersion powders.

DE-OS 4021216 describes the preparation of a polymer powder, where a film-forming dispersion polymer is sprayed with an completely or partially neutralized water-soluble copolymer consisting of 50 to 80 weight % of unsaturated carboxylic acids and an alkene and/or styrene as spray additive. According to EP 0 671 435, aqueous protective-colloid-containing acrylate dispersions can be sprayed to powder redispersible binders using 0.01 to 30 weight % of water-soluble or water-dispersible resins, which consist of 30 to 50 weight % of hydrophilic, water-soluble and salt-forming monomers and 50-70 weight % of hydrophobic, essentially water-insoluble monomers. In EP 0522791, the preparation of powders by spraying of core-shell products is described, where an alkali-insoluble core is surrounded by an alkali-soluble shell. The core-shell dispersion is sprayed after neutralization with an amine or a base.

All the redispersible powders named above are based on a uniform basic principle of preparation: To the polymer to be sprayed, a spraying aid is added, which is first in the dissolved form at the beginning of the spray-drying process and deposits on the particles to be sprayed during drying, as a “protective shield”. The spraying aid has a great influence on the properties of the powder. First of all, it should provide as good a redispersibility to the polymer powder as possible, and, on the other hand, together with the commonly used antiblocking agent, should prevent blocking of the powder during storage. Moreover, the spraying aid should not have an adverse influence on the application-technological properties of the polymer to be sprayed, but should influence these as advantageously as possible.

The task of the present invention was to prepare a redispersible polymer powder which is characterized, in contrast to the above, by the fact that, with the same amount of spraying aid (weight %, based on the polymer to be sprayed), a clearly improved resistance to blocking is achieved. Moreover, the preparation of the powder according to the invention should result in a simplification of the manufacturing technology.

In developing the solution, it was shown that good redispersible dispersion powders can be prepared not only in the usual way, by the use of a spraying aid present in the dissolved form, but that, surprisingly, this is possible even when using an additive that is not dissolved, when this has a particle size which is clearly smaller than the particle size of the dispersion to be sprayed.

This is achieved by redispersible polymer powders, prepared by spray-drying of an aqueous dispersion, which is obtained by mixing an aqueous polymer dispersion 1 (containing polymer I) with an aqueous polymer dispersion 2 (containing polymer II), where the diameter of the particles of polymer I is greater than the diameter of the particles of polymer H by a factor of 5 to 150, preferably 10 to 50, and polymer I is a polymer that forms films at room temperature, while polymer II has a glass-transition temperature which is higher than that of polymer I, is insoluble in water and thus it is present in the undissolved form in the aqueous dispersion to be sprayed.

The glass temperature of polymer H should be higher than the temperature at the exit of the spray dryer. The amount of polymer II, which is needed (weight % based on polymer I), in order to achieve a certain resistance to blocking, which becomes smaller as polymer I and polymer II differ more with regard to their particle size. The amount of polymer II which is used lies at 5 to 40 weight %, preferably 10 to 30 weight %. Before spraying the additive, surface-active substances can be added to the aqueous dispersion to improve the redispersibility.

Preferably, polymer II consists of 5 to 80 weight %, especially 20 to 50 weight % of a copolymerized, unsaturated carboxylic acid and is thus entirely or partially soluble in alkali, while the pH value of the aqueous dispersion to be sprayed is kept so low that polymer II is present in the undissolved form.

Advantageously, methacrylic acid or acrylic acid is used as the unsaturated carboxylic acid.

The spray drying of the aqueous dispersion is done in a commercial pilot plant spray dryer in cocurrent. Air is used as drying gas, which enters the dryer at a temperature of 115EC and leaves it at a temperature of 60EC. The dispersions I and II are always sprayed in as a mixture of dispersion through a two-material nozzle. The addition of antiblocking agents (ABM) is done through a second two-material nozzle also in cocurrent. The powder is deposited in a cyclone which is connected at the end.

In the examples given below, polymer dispersions with the following composition were used:

Particle size Dispersion (TGv nm) A styrene/butyl acrylate/acrylamide 600 (Tg according to Fox: 0EC) B styrene/butadiene 200 (Tg according to Fox: 5EC) C methyl methacrylate/methacrylic acid 25 (35 weight % methacrylic acid) D methyl methacrylate/methacrylic acid 260 (35 weight % methacrylic acid) E styrene 20 F styrene 190

In Table 1, the Examples are characterized more closely and essential data are summarized about the properties of the polymer powders produced.

TABLE 1 polymer powder sedim. sedim. 1/24 aqueous dispersion 1/24 h h ABM blocking Example pH polymer I % polymer II % (pH < 7) (pH > 10) (%) resistance 1 <7 A 80 C 20 4/24 1/7  5 12 2 <7 A 85 C 15 6/27 2/10 5 17 3 V <7 A 80 D 20 9/38 7/27 5 30 4 V >10 A 80 C 20 2/8  5 36 5 >7 A 80 E 20 5/17 5 24 6 V >7 A 80 F 20 25/46  5 60 7 >7 B 80 E 20 4/14 5 20 8 V >7 B 80 F 20 15/35  5 50 V = Comparison Example

The addition of other additives (for example, surface-active substances) was done so that samples compared with one another always contained the same amount of them.

It can be seen in Table I that the ratio of the particle sizes of polymer I: polymer II has a decisive influence on the sedimentation and tendency to blocking (comparison of Example 1 with Example 3, comparison of Example 5 with Example 6 and comparison of Example 7 with Example 8). It can be seen that the examples prepared according to the invention show clearly better values, both with regard to sedimentation as well as resistance to blocking (see in this connection “Explanation of the methods of investigation”).

Example 1 differs from Comparison Example 4 only in the fact that Example 4 was used at a pH >10 and thus polymer II was sprayed in the dissolved state. It was found that this made the resistance to blocking clearly worse.

The polymer powders from Example I and from Example 4 were added to a mixture of 78 weight % of standard sand and 22 weight % of cement (32.5) and a mortar was prepared from this (plastic : cement ratio always 0.1, water: cement 0.45), which was then investigated according to EN 196.

It can be seen from Table 2 that the greatly improved resistance to blocking of the powder produced according to the invention is not reached at the expense of significant application-technological properties. Both the bending tensile strength, as well as the compressive strength of the produced concrete show better values when prepared with the addition of the powder according to Example 1.

TABLE 2 bending tensile extent of density strength expansion prisms (N/mm2), compressive strength Example (mm) (g/cm3) 14 days (N/mm2), 14 days 1 148 2.11 7.4 37 4 V 152 2.12 6.9 33 Explanation of the Methods of Investigation:

Blocking test: First, a tablet is formed from the powder and a weight is made to act on a stamp, which is loaded onto the powder in a metal cylinder of 50 mm diameter for 24 hours. A load is chosen which is greater than occurs approximately during storage in pallets, in order to make tabletting possible, even in the case of powders which show hardly any tendency to blocking, so that this method can also be used in the comparison with powders having very good blocking behavior.

The obtained tablet is introduced in the horizontal position into a hollow cylinder rotating along its longitudinal axis, the surface of which is covered with sieving fabric. The cylinder turns at a velocity of 40 rpm, and the weight of the powder falling through the sieving fabric is determined. The time is determined within which 50% of the weight of the tablet went through the sieve. The shorter this time, the lower the tendency of the powder to blocking. Under the selected conditions, commercial powders reach values of 10 to 20 seconds.

Sedimentation: This value yields information about the redispersibility of the investigated powder.

For this purpose, the powder is redispersed in water at a ratio of 1:1 and then diluted, 50 g of the 5% redispersions are filled into calibrated tubes and after 1 hour and 24 hours, the height of the sedimented layer is measured; the lower the obtained values the better is the redispersibility of the powder.

In Table 1, in the case of using alkali-soluble polymers, in addition, the sedimentation of the redispersion prepared at pH>10 is determined, since this comes closer to the conditions when using the powder in the mortar.

Under the selected redispersion conditions, commercial powders show values of approximately 2 and 8-10 mm.

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